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Taxonomic revision of the olingos (Bassaricyon), with description of a new species, the Olinguito
Kristofer M. Helgen; C. Miguel Pinto; Roland Kays; Lauren E. Helgen; Mirian T. N. Tsuchiya; Aleta Quinn; Don E. Wilson; Jesús E. Maldonado
ZooKeys , iss. , pp.1-83

AbstractEdit

AbstractWe present the first comprehensive taxonomic revision and review the biology of the olingos, the endemic Neotropical procyonid genus Bassaricyon, based on most specimens available in museums, and with data derived from anatomy, morphometrics, mitochondrial and nuclear DNA, field observations, and geographic range modeling. Species of Bassaricyon are primarily forest-living, arboreal, nocturnal, frugivorous, and solitary, and have one young at a time. We demonstrate that four olingo species can be recognized, including a Central American species (Bassaricyon gabbii), lowland species with eastern, cis-Andean (Bassaricyon alleni) and western, trans-Andean (Bassaricyon medius) distributions, and a species endemic to cloud forests in the Andes. The oldest evolutionary divergence in the genus is between this last species, endemic to the Andes of Colombia and Ecuador, and all other species, which occur in lower elevation habitats. Surprisingly, this Andean endemic species, which we call the Olinguito, has never been previously described; it represents a new species in the order Carnivora and is the smallest living member of the family Procyonidae. We report on the biology of this new species based on information from museum specimens, niche modeling, and fieldwork in western Ecuador, and describe four Olinguito subspecies based on morphological distinctions across different regions of the Northern Andes.

IntroductionEdit

“New Carnivores of any sort are always few and far between…”

Oldfield Thomas (1894:524)

Olingos (genus Bassaricyon J.A. Allen, 1876) are small to medium-sized (0.7 to 2 kg) arboreal procyonids found in the forests of Central America and northern South America. No comprehensive systematic revision of the genus has ever been undertaken, such that species boundaries in Bassaricyon are entirely unclear, and probably more poorly resolved than in any other extant carnivoran genus. There are various reasons for limited knowledge of Bassaricyon. For such a widespread genus of Carnivora, olingos were discovered surprisingly late (first described from Central America in 1876 and from South America in 1880; [1], [2]); they were long known by few specimens in museum collections; they are often overlooked in the field because they are regularly confused with another better known procyonid, the kinkajou, Potos flavus (Schreber, 1774) (e.g., [2], [3], [4], [5]); and they are often largely or entirely omitted from both authoritative and popular references on Neotropical wildlife and natural history (e.g., [6], [7], [8]). In the absence of a detailed systematic review, five species of Bassaricyon are tentatively recognized in most recent taxonomic references, including three species in Central America (Bassaricyon gabbii Allen, 1876; Bassaricyon lasius Harris, 1932; Bassaricyon pauli Enders, 1936) and three species in South America (with Bassaricyon gabbii recognized as occurring west of the Andes, and Bassaricyon alleni Thomas, 1880 and Bassaricyon beddardi Pocock, 1921a east of the Andes), but most authors have explicitly identified a longstanding need for a detailed taxonomic overview to clarify species diversity and distributions in this genus ([9], [10], [11], [12], [13], [14], [15], [16], [17], [18], [19], [20], [21], [22], [23], [24], [25], [26], [27], [28], [29], [30], [31], [32], [33], [34], [35], [36], [37], [38], [39]).

Here we review the taxonomic standing of all named forms of Bassaricyon based on morphological, morphometric, and molecular comparisons of voucher specimens in museums; we clarify the distribution and conservation status of each valid taxon; and, as far as possible, we enable information from published literature on olingo anatomy (e.g., Beddard 1900, [40], [41], [42], [43], [44], [45], [46]), ecology and behavior (e.g., [47], [14], [48], [49], [50], [51], [52], [53], [54], [55], [56], [57], [58], [59], [60], [26], [27], [28], [61], [62]), and parasites and disease (e.g., [63], [64], [65], [66], [67]) to be associated with particular olingo taxa now recognized as valid.

All previously described olingo taxaoccur in lower to middle-elevation tropical or subtropical forests (≤ 2000 meters in elevation). Remarkably, our morphological, morphometric, molecular, and field studies document the existence of an undescribed species in the genus, endemic to higher-elevation cloud forests (1500 to 2750 meters) in the Western and Central Andes of Colombia and Ecuador, which we describe here as a new species. (This species has been discussed preliminarily, in advance of its formal description, by [23] and [22].) This species, upon which we bestow the common name of Olinguito (oh-ling-GHEE’-toh), is the sister taxon to a lineage comprising all previously described species of Bassaricyon; is the smallest living procyonid; and is the first new species of American carnivore described since the discovery of the Colombian weasel (Mustela felipei) in similar habitats in the same region of the Andes more than three decades ago ([68]). We discuss what is known to date of the biology of this remarkable new procyonid, the Olinguito.

Materials and methodsEdit

Museum specimens and comparisonsEdit

We examined all Bassaricyon specimens in the collections of the American Museum of Natural History, New York, USA (AMNH); Academy of Natural Sciences, Philadelphia, USA (ANSP); Natural History Museum, London, UK (BMNH); Museo de Zoología, Universidad Politecnica, Quito, Ecuador (EPN); Field Museum of Natural History, Chicago, USA (FMNH); Biodiversity Institute, University of Kansas, Lawrence, USA (KU); Los Angeles County Natural History Museum, Los Angeles, USA (LACM); Museum of Comparative Zoology, Harvard University, Cambridge, USA (MCZ); Museo Ecuatoriano de Ciencias Naturales, Quito, Ecuador (MECN); Museum of Vertebrate Zoology, University of California, Berkeley, USA (MVZ); Naturhistoriska Riksmuseet, Stockholm, Sweden (NMS); Museo de Zoología, Pontificia Universidad Católica del Ecuador, Quito, Ecuador (QCAZ); Royal Ontario Museum, Toronto, Canada (ROM); Biodiversity Research and Teaching Collections, Texas A&M University, College Station, USA (TCWC); Museum of Zoology, University of Michigan, Ann Arbor, USA (UMMZ); National Museum of Natural History, Smithsonian Institution, Washington, D.C., USA (USNM); Peabody Museum of Natural History, Yale University, New Haven, USA (YPM); and Museum für Naturkunde, Humboldt Universität, Berlin, Germany (ZMB). These holdings include all type specimens in the genus and represent the great majority (well over 95%) of olingo specimens in world museums. We also had access to published information on a few additional specimens in museum collections in Colombia and Bolivia ([69], [70]). Tissue samples are stored in the frozen tissue collections of the MVZ, ROM, USNM (including specimens to be accessioned at QCAZ), the New York State Museum, Albany, New York, USA (NYSM), and the Museum of Texas Tech University, Lubbock, Texas, USA (TTU) (Table 1).

Table 1.Edit

"List of samples (and associated information) used in phylogenetic analysis. Boldfaced entries represent samples newly sequenced in this study."
SPECIESIdentifier in Figure 1Specific localitySource (catalog reference)Genbank Accession Numbers
Cytochrome bCHRNA1
Bassaricyon medius orinomusPanamaLimbo plotNYSM ZT105EF107703KC773757
Bassaricyon medius orinomusPanamaRio Juan GrandeNYSM ZT106EF107704KC773758
Bassaricyon medius orinomusPanamaLimbo plotKoepfli et al. (2007)DQ660300DQ660210
Bassaricyon medius mediusEcuadorLas PampasQCAZ 8659; tk149097EF107706KC773759
Bassaricyon medius mediusEcuadorLas PampasQCAZ 8658; tk149094EF107707KC773760
Bassaricyon alleniGuyanaIwokramaROM 107380EF107710KC773763
Bassaricyon alleniPeruRio CenapaMVZ 155219; Koepfli et al. (2007)DQ660299DQ660209
Bassaricyon gabbiiCosta RicaMonteverdeKU 165554JX948744---
Bassaricyon neblina neblinaEcuadorLa CanteraQCAZ 8662; tk149108EF107708KC773761
Bassaricyon neblina neblinaEcuadorOtonga ReserveQCAZ 8661; tk149001EF107709KC773762
Bassaricyon neblina osborniColombiaVicinity of CaliGenbankX94931DQ533950
Potos flavusPotos flavusCosta Rica[71]DQ660304DQ660214
Procyon cancrivorusProcyon cancrivorusParaguay[71]DQ660305DQ660215
Procyon lotorProcyon lotorMontana, USA[71]DQ660306AF498152
Bassariscus astutusBassariscus astutusArizona, USA[71]AF498159AF498151
Bassariscus sumichrastiBassariscus sumichrastiMexico[71]DQ660301DQ660211
Nasua nasuaNasua nasuaBolivia[71]DQ660303DQ660213
Nasua naricaNasua naricaPanama[71]DQ660302DQ660212
Enhydra lutrisMustelidaeAttu Island, Alaska, USA[71]AF057120AF498131
Eira barbaraMustelidaeBolivia[71]AF498154AF498144
Taxidea taxusMustelidaeNew Mexico, USA[71]AF057132AF498148
Neovison visonMustelidaeTexas, USA[71]AF057129AF498140
Martes americanaMustelidaeRocky Mtn Research Station, USA[71]AF057130.1AF498141
Lontra longicaudisMustelidaeKagka, Peru[71]AF057123.1AF498134
Ictonyx libycaMustelidaeBrookfield ZooGenbankEF987739.1EF987699
Meles melesMustelidaeNo voucher infromation[71]AM711900.1AF498147
Mephitis mephitisMephitidaeSan Diego Zoo[72], [73]HM106332.1GU931029.1
Spilogale putoriusMephitidae[74], [72]NC_010497.1GU931030.1
Ailurus fulgensAiluridae[74], [72]AM711897.1GU931037.1
Arctocephalus australisOtariidae[75], [76]AY377329.1DQ205738.1
Odobenus rosmarusOdobenidae[77], [78]GU174611.1DQ093076.1
Phoca fasciataPhocidae[78]GU167294.1GU167764.1
Mirounga angustirostrisPhocidae[77], [79]AY377325.1DQ093075.1
Canis lupusCanis lupus[80], [76]AY598499DQ205757
Nyctereutes procyonoidesother Canidae[72], [81]GU256221GU931027.1
Urocyon cinereoargenteusother Canidae[72], [82]JF489121.1GU931028.1
Ailuropoda melanoleucaUrsidae[77], [79]NC_009492DQ093074.1
Ursus americanusUrsidae[83], [76]NC_003426.1DQ205726.1

Values from external measurements of 95 specimens are presented to provide an appreciation of general body size and lengths and proportions of appendages. Values (in mm) for total length and length of tail are those recorded by collectors on labels attached to skins; subtracting length of tail (abbreviated TV) from total length produced a value for length of head and body (HB). Values for length of hind foot (HF), which includes claws, were either obtained from skin labels or from our measurements of dry study skins; those for length of external ear (E), or pinna, come from collector’s measurements recorded on skin labels or in field journals (we assume, but are not certain for all specimens, that ear-length measurements represent the greatest length from the notch to the distal margin of the pinna).

Morphological terminology follows [84] and [85]. Craniodental variables were measured by the first author with digital calipers to the nearest 0.1 mm. Single-tooth measurements are measured on the crown. All measurements of length are in millimeters, and measurements of mass are given in grams. Only fully adult, wild-collected specimens that are sufficiently intact were included in our morphometric analyses. A total of 115 specimens were included (51 male, 64 female). The classification of ‘‘adult’’ was applied generally only to skulls in which the full dentition is completely erupted, and in which the basilar (basioccipital-basisphenoid) suture (synchondrosis) in particular is obliterated via ossification. Variables measured include maximum crown widths (W) of premolars (p1, p2, p3, p4, P2, P3, P4, with lower case designating lower teeth and uppercase designating upper teeth) and molars (m1, m2, M1, and M2); maximum crown lengths (L) of the larger premolars and molars (P4, M1, M2, m1, and m2); condylobasal length (CBL), zygomatic width (ZYG), breadth of braincase (BBC), external width across the canines (CC), and length of the maxillary toothrow, C-M2 (MTR), all as defined by [86]; and four posterior skull measurements: greatest width across the postdental palatal shelf (WPP), length of the postdental palate behind an imaginary line delineated by the back of the second molars (LPP), anteroposterior length of the auditory bullae including the eustachian tube (LAB), and the dorsoventral diameter inside the external auditory meatus (EAM). Unless explicitly noted, all reported metrics (and resulting statistical and multivariate comparisons) refer only to fully mature (adult) specimens, as judged by direct examination of skulls. Because some olingo taxa demonstrate significant sexual dimorphism in cranial measurements, patterns of morphometric variation in males and females were compiled and analyzed separately. Principal Component Analysis (PCA) and Discriminant Function Analyses (DFA) were undertaken using a combination of cranial and dental measurements indicated in tables and in the text, selected to sample craniodental size and shape, and to maximize sample size. All measurement values were transformed to natural logarithms prior to multivariate analysis. Principal components were extracted from the covariance matrix. The software program Statistica 8.0 (Statsoft Inc., Tulsa, Oklahoma, USA) was used for all multivariate analyses.

The taxa and sequences included in our analysis are listed in Table 1. Our choice of taxa outside of Bassaricyon was guided by the findings of [71], [87], and [72]. These studies provide strong statistical support for relationships and divergence dates within Procyonidae and Carnivora based on >6,000 bases of DNA and fossil evidence. We chose one mitochondrial marker and one nuclear marker used in these and many other mammalian studies, in order to capture the evolutionary histories of these distinct genetic systems. Although deeper relationships within the order Carnivora cannot be resolved solely by using these two genes, we are confident that they provide the appropriate level of support to resolve species-level relationships within this group of procyonids ([71]). As our specific goal was to estimate the timing of divergence within Bassaricyon, and our reduced dataset did not provide enough support to resolve deeper nodes in Caniformia, we decided to use highly supported divergence date estimates from [71] and [72] as priors in our analysis.

DNA extractionEdit

Tissues from fresh and frozen specimens were processed using a Qiagen DNeasy kit (QIAGEN, Valencia, CA, USA) to obtain genomic DNA. The sample from the skull of KU 165554, a museum specimen of Bassaricyon gabbii, was taken from the turbinate bones and extracted following the method of [88]. Including this turbinate sample of Bassaricyon gabbii, we successfully extracted DNA from eight individuals of Bassaricyon (four Bassaricyon medius, one Bassaricyon alleni, and two Bassaricyon neblina sp. n.). All pre-PCR protocols were conducted in an isolated ancient DNA laboratory facility located in a separate building from the one containing the primary DNA laboratory.

DNA SequencingEdit

Mitochondrial gene, cytochrome b: For cytochrome b (1140 bp), polymerase chain reaction (PCR) and sequencing reactions were carried out with primers LGL 765 and LGL 766 from [89] and using a thermal cycler (MJ Research, Waltham, MA, USA) under the following conditions, repeated for 35 cycles: denaturation at 92°C for 1 min, annealing at 50°C for 1 min, extension at 72°C for 1 min. The PCR reagents in a 25 μL reaction were 0.2 μL AmpliTaq (5 units μL-1, Applied Biosystems, Foster City, CA, USA), 1μL per primer (10 μM), 2.5 μL dNTP (2 μM), 2 μL MgCl2 (25 mM), 2.5 μL AmpliTaq Buffer (Applied Biosystems), 2μL BSA (0.01 mg/μL), 1 μL gDNA and 12.8 μL sterile water. To amplify DNA from turbinate samples, PCR and sequencing were carried out with internal primers designed for this study using sequences generated from the tissue samples; the reverse primer, H151949Pro (5’ CTCCTCAAAAGGATATTTGYCCTCA 3’), located at 14611 – 14636 on the Nasua nasua mitochondrial genome, was used with LGL 765. A new forward primer, BAS420F (5’ TCAGACAAAATCCCCTTCCA 3’), position 14825 - 14845 on the Nasua nasua mitochondrial genome, was used with LGL 766. The thermal cycle regime was modified to 50 cycles; reagents were as above.

Nuclear intron, Cholinergic Receptor Nicotinic Alpha Polypeptide 1 precursor (CHRNA1): For CHRNA1 (347 bp), we used the primers described by [90] and the thermocycling conditions consisted of an initial denaturation (95°C for 10 min), followed by 30 cycles of denaturation at 95°C for 30 s, annealing at 54°C for 30 s and extension for 72°C for 45 s, and final extension of 72°C for 5 min. Reagent volumes were the same as for cytochrome b amplification (above), except 2μL of gDNA was added for CHRNA1 amplification, decreasing sterile water volume to 10.8μL. We were unable to sequence the nuclear intron from the turbinate bone sample.

Each PCR was conducted with negative and positive controls to minimize risk of spurious results from contamination or failure of the reaction. A 2μL sample of the PCR product was stained with ethidium bromide and run on an agarose gel with a 1 kb ladder. The gel was placed under UV light to visualize the PCR products. Polymerase chain reaction products were amplified for sequencing using a 10 μL reaction mixture of 2 μL of PCR product, 0.8 μL of primer (10 μM), 1.5 μL Big Dye 5 x Buffer (Applied Biosystems), 1 μL Big Dye version 3 (Applied Biosystems), and 4.7 μL sterile water. The reaction was run using a thermal cycler (MJ Research) with denaturation at 96°C for 10 s, annealing at 50°C for 10 s and extension at 60°C for 4 min: this was repeated for 25 cycles. The product was cleaned using sephadex filtration method and sequences for both strands were run on a 50 cm array using the ABI PRISM 3100 Genetic Analyzer (Applied Biosystems).

Molecular analysisEdit

Sequences were aligned and edited in Sequencher version 4.1.2 using the implemented Clustal algorithm and the default gap penalty parameters (Gene Codes Corporation, Ann Arbor, MI, USA, http://www.genecodes.com).

For Bassaricyon, we included all newly sequenced and previously available sequences for cytochrome b and CHRNA1 (for cytochrome b this included five individuals of Bassaricyon medius, two Bassaricyon alleni, one Bassaricyon gabbii and three Bassaricyon neblina sp. n.; for CHRNA1 this included five individuals of Bassaricyon medius, two Bassaricyon alleni, and three Bassaricyon neblina sp. n.) (Table 1).

Maximum Parsimony, Maximum Likelihood and Bayesian analyses were performed for each gene and a concatenation of the two genes to check for any incongruence in structure and support of the Bassaricyon clade. All Bayesian and Maximum Likelihood phylogenetic inferences were carried out using the Cipres Portal ([91]). Indels were treated as missing data or non-informative data for all of the analyses as in previous molecular phylogenetic studies of procyonids ([71]; [72]).

Pairwise distances for cytochrome b were generated using the Kimura 2-parameter model using MEGA4 ([92]).

The branch and bound search method implemented in the software package TNT ([93]) was used for the maximum parsimony analyses. Parsimony bootstrap support was generated using the heuristic search method with 100 random stepwise additions for 1000 replicates.

Maximum Likelihood analysis was conducted using the software package GARLI 0.96b ([94]). The genetic-like algorithm was used to simultaneously find the topology, branch lengths and substitution model parameters with the greatest log-likelihood (lnL) for each dataset. Bootstrap support was generated with 1000 replicates and two independent searches per replicate.

jModeltest version 0.1.1 ([95]) was used to find the best model of sequence evolution. We chose to partition the cytochrome b data in order to minimize the number of parameters and to account for differences in base composition and substitution rates among the different codon positions ([96]). The software PartitionFinder ([97]) was used to determine the best partitioning scheme, and for the cytochrome b, the scheme with 1st, 2nd, and 3rd codon positions partitioned separately was selected. The best fit model under the Bayesian information criterion (BIC) for cytochrome b for the first and second codon position partitions was HKY + G + I ([98]), and for the third codon position, the best model under BIC was TrN + I + G ([99]). The model chosen for CHRNA1 was K80 + G ([100]). The parameters were then applied in MrBayes version 3.1p ([101]). The model parameters were set to nst = 2 using a gamma distribution for CHRNA1, nst = 2 and the rate parameter invariant with a gamma distribution for the cytochrome b 1st and 2nd codon partitions, and nst = 6 with a gamma distribution and rate parameter invariant for cytochrome b 3rd codon partition. Since this version of MrBayes did not include the specific model selected for the cytochrome b 3rd codon position partition, we opted for using a more complex model (nst = 6) following the results of [102]. The Bayesian analysis was run using 5,000,000 generations along four chains with 2 replicates at a temperature of 0.05. The convergence between the two replicates run in MrBayes was assessed by the average standard deviation of split frequencies (ASDSF) between runs. After 5,000,000 generations, the ASDSF was 0.003. Sample frequency was set to 1000 with a burn-in of 1,250.

Molecular divergence estimates were generated in BEAST ([103]). The following calibration nodes were included based on [72]: Nasua – Bassaricyon truncated normal mean 7.2 million years ago (mya) (± 1.7 s.d.); -Potos truncated normal mean 16.2 mya (± 2.5 s.d.); Procyonidae normal mean 20.7 mya (± 4.0 s.d.); Procyonidae-Mustelidae-Ailuridae-Mephitidae normal mean 30 mya (± 7.0 s.d.); Phoca-Mirounga normal mean 20 mya (± 6 s.d.); Caniformia normal mean 48 mya (± 6.5 s.d.). The molecular clock was estimated using the uncorrelated lognormal setting, operators were left to the default setting, and trees were searched using the Yule process. The substitution and clock models were left unlinked, partition tree model was linked, and the models for the two gene partitions were: cytochrome b (1), (2), and (3) => TN93 + I + G (all parameters unlinked) and CHRNA1 K80 + G (HKY + G). In order to evaluate the effects of the priors on the divergence time estimates, we carried out a run using an empty alignment but with the same settings and compared it to our results,with the outcome indicating that the priors are not having an especially strong effect on the estimated divergence times ([104]).

To infer geographical range evolution of procyonids we used the Maximum Likelihood model of dispersal-extinction-cladogenesis (DEC) implemented in Lagrange v. 20130526 ([105]). The BEAST chronogram tree was trimmed to keep one representative per procyonid species, and two additional lineages, one representing Mustelidae and one representing Mephitidae. Six general geographic areas were used to characterize the distribution ranges: Eurasia, North America, Central America, Chocó, Andes, and Amazonia. The branches of the mustelid and mephitid lineages were treated as belonging to the ancestors of the families and their hypothesized distributions are according to previous ancestral range estimations ([106], [107]). Reconstruction of potential ancestral area combinations and dispersal scenarios took into account realistic dispersal routes (e.g., allowing Eurasia to connect only with North America) and the geological history of the region (e.g., formation of the Panama Isthmus during the late Miocene and Pliocene; [108], [109]).

Bioclimatic range modelingEdit

Vouchered localities of occurrence for Bassaricyon used in our analyses were extracted from museum specimen labels, often as clarified by associated field notes and journals, and from definitive published accounts. Gazetteers published by [110], [111], [112]), [113], [114]), [115], [116], [117], and [118] were especially helpful in georeferencing Neotropical expedition and collecting localities represented in museum collections.

We used Maximum Entropy Modeling (Maxent) ([119]) to predict the geographic range of the geographic range of the four Bassaricyon species at broad scales based on vouchered localities (Appendix 2) and 20 environmental variables representing potential vegetation and climate. For potential vegetation we used the 15 major habitat types classified as ecological biomes ([120]). For climate we used 19 BIOCLIM variables representing annual trends, seasonality, and extremes in temperature and precipitation across Central and South America (derived from [121] as described at http://www.worldclim.org/bioclim.htm). We used all vouchered specimen localities to train the final model (excluding published records based only on visual observations). We also tested overall performance by running 10 model iterations while randomly withholding 20% of the points as test locations. To produce geographic ranges showing presence/absence of a species we used the average equal training sensitivity and specificity for the 10 test models as our probability cutoff value ([119]).

ResultsEdit

PhylogeneticsEdit

With the largest molecular sampling effort to date, we show that Bassaricyon is well resolved as a monophyletic genus (cf. [122]) within the family Procyonidae. All of our analyses resolve Bassaricyon as a clade with bootstrap and probability values of 100%. The sister genus to Bassaricyon is Nasua, a relationship consistently recovered in our analyses with 100% support. The divergence between Bassaricyon and Nasua was estimated at 10.2 million years old (mya) (95% Confidence Interval [CI] = 7.6 – 12.7 mya), consistent with previously published results ([71], [72]).

The family Procyonidae is well resolved as monophyletic (100% bootstrap and probability values) with a divergence date of 21.4 mya (CI 18.1 – 25.0 mya), in agreement with the divergence estimate of 22.6 mya (CI 19.4 – 25.5 mya) by [72]. [72] had a more constrained confidence interval on the age of this divergence, due to the incorporation of genes that are more informative at deeper nodes in the tree. We chose CHRNA1 and cytochrome b with a focus toward resolving relationships within Bassaricyon; these markers are far more useful for determining relationships in recent radiations within Procyonidae than the deeper relationships within Carnivora. The only part of the Procyonidae where CHRNA1 and cytochrome b did not provide sufficient resolution to re-construct recently published multi-gene topologies ([71], [72]) was the divergence between the two species of Bassariscus, and Procyon. In our BEAST chronogram the divergence for Bassariscus is 7.6 mya (CI 4.8 – 10.6 mya) but the branch leading to their divergence has no support, and therefore is collapsed in the phylogeny (Figure 1; see also [71], [72]). The other procyonid genera are well-supported monophyletic groups; according to our chronogram Procyon lotor and Procyon cancrivorus diverged 4.2 mya (CI 2.3 – 6.5 mya) and Nasua narica and Nasua nasua diverged 5.6 mya (CI 3.5 – 7.9 mya).

 
Phylogeny of the genus Bassaricyon. Phylogeny generated from the concatenated CHRNA1 and cytochrome b sequences. All analyses consistently recovered the same relationships with high support. Divergence dating was generated in BEAST; bars show the 95% confidence interval at each node. Branches without support are collapsed and outgroup clades have been collapsed, leaving monophyletic groupings with 100% support. Data for CHRNA1 are missing for Bassaricyon gabbii, for which DNA was extracted from a museum skull. All nodes in Bassaricyon have 1.00 Bayesian posterior probability, except the split between Bassaricyon gabbii and Bassaricyon alleni/Bassaricyon medius (0.97 Bayesian posterior probability). Non-focal and outgroup taxa are shaded in gray, Bassaricyon species and subspecies are color coded, samples of Bassaricyon medius medius and Bassaricyon neblina neblina that were collected within 5 km of each other in Ecuador are shaded.

The concordance of our recovered topology and estimates of genetic divergence with previous phylogenetic studies of the Procyonidae suggests that data from cytochrome b and CHRNA1 across sampled taxa have provided a well-supported framework in which the species relationships and divergence dates within Bassaricyon can be reliably assessed. Previous molecular phylogenetic studies have included either only one species (e.g., [123], [124], and further studies using the same sequences, see below), identified as “Bassaricyon gabbii” (Genbank identifier X94931), but actually representing Bassaricyon neblina sp. n.; or, two species ([71]), identified as Bassaricyon alleni (correctly, sample from Amazonian Peru) and “Bassaricyon gabbii” (actually Bassaricyon medius orinomus,from Panama). [71] gave the divergence estimate for these latter two taxa (i.e. Bassaricyon alleni and Bassaricyon medius orinomus) as 2.5–2.8 mya (CI 1.2–5.0 mya). Our results indicate that the earliest divergence within Bassaricyon, corresponding to the split between the ancestors of Bassaricyon neblina sp. n. and other Bassaricyon, occurred 3.5 mya (CI = 2.1 – 5.2 mya). Sequence divergence in cytochrome b between Bassaricyon neblina sp. n. and other Bassaricyon (including specimens of Bassaricyon medius medius collected in regional sympatry with Bassaricyon neblina sp. n. in the Western Andes of Ecuador) is 9.6-11.3% (Table 2). Cytochrome b sequence divergences between Bassaricyon gabbii, Bassaricyon medius, and Bassaricyon alleni are 6-7% (Table 2). Subspecific distances (see Systematics, below, for discussion of subspecies boundaries) are 1.6-2.0% within Bassaricyon medius (between Bassaricyon medius medius and Bassaricyon medius orinomus) and 1.6% within Bassaricyon neblina sp. n. (between Bassaricyon neblina neblina subsp. n. and Bassaricyon neblina osborni subsp. n., the two subspecies for which we have molecular data).

Table 2.Edit

"Percentage sequence divergence in cytochrome b sequences (Kimura 2-Parameter) among specimens of Bassaricyon (numbers 1-11) and other Procyonidae (numbers 12-18) in our analyses (see Table 1, Figure 1). Numbers across the top row match numbered samples in the vertical column."
1234567891011121314151617
1. Bassaricyon medius orinomus (Panama)
2. Bassaricyon medius orinomus (Panama)0.2
3. Bassaricyon medius orinomus (Panama)0.30.4
4. Bassaricyon medius medius (Ecuador)1.91.91.6
5. Bassaricyon medius medius (Ecuador)1.92.01.60.1
6. Bassaricyon alleni (Guyana)6.97.06.67.27.4
7. Bassaricyon alleni (Peru)6.36.46.06.36.51.3
8. Bassaricyon gabbii (Costa Rica)7.37.17.06.96.76.36.6
9. Bassaricyon neblina neblina (Ecuador)10.110.19.810.410.611.311.09.9
10. Bassaricyon neblina neblina (Ecuador)10.110.19.810.510.611.311.09.90.0
11. Bassaricyon neblina osborni (Colombia)10.09.99.610.310.411.210.610.41.61.6
12. Potos flavus28.728.928.729.529.529.829.028.129.829.928.9
13. Procyon lotor34.834.334.335.234.935.634.933.033.833.732.727.3
14. Procyon cancrivorus31.931.231.232.232.032.129.931.932.031.830.429.413.1
15. Bassariscus astutus30.730.530.029.830.030.830.029.429.329.129.529.620.717.8
16. Bassariscus sumichrasti28.127.427.727.727.927.725.728.326.226.125.626.817.118.315.8
17. Nasua nasua26.826.726.728.128.425.424.125.725.024.824.135.635.830.330.529.1
18. Nasua narica30.329.730.030.230.029.029.228.825.125.124.231.329.726.427.326.320.4

We obtained the highest bootstrap and posterior probability support values (100% and 1.0 respectively) for relationships within Bassaricyon with every method of phylogenetic inference that was used in this study. The single exception was that the topology that recovered the node uniting Bassaricyon alleni and Bassaricyon medius to the exclusion of Bassaricyon gabbii was assigned a slightly lower Bayesian posterior probability value of 0.97, but all other methods lent full support to this topology (Bassaricyon gabbii,(Bassaricyon medius, Bassaricyon alleni)). These results were also well-supported by our comparisons of morphological characters and together lend strong support for this scenario as being an accurate representation of the evolutionary history of diversification within Bassaricyon.

BiogeographyEdit

The historical biogeographic reconstruction for the Procyonidae using the DEC model sets Central America as the likely center of origin of crown-group procyonids (Figure 2) (though we note that the family has many extinct, Eocene to Miocene representatives in North America and Europe). Major splits within the family appear to have occurred in Central America previous to the formation of the Panamanian Isthmus, and all the dispersal events resulting in the extant species have occurred within the last 10 million years. All those dispersal events involving southward movements seem to have occurred up to circa 6 mya, coinciding with the initial uplift of the Panamanian Isthmus, and, presumably once it was consolidated, with the Great American Biotic Interchange (GABI) (Figures 1–2). The clade containing all olingo species is likely to have originated directly as a result of the formation of the Panamanian Isthmus, and provides evidence of a complex pattern of dispersal events out of Central America (Figure 2).

 
Historical biogeography of procyonids. Reconstructed under the DEC model implemented in Lagrange. See legend for geographical areas used in the analysis. Colored squares at the tip of the branches reflect the distribution of taxa, and previously inferred distributions of the ancestors of mustelids and mephitids. Colored squares at the nodes represent the geographic ranges with the highest probabilites in the DEC model inherited by each descendant branch. Colored arrows reflect dispersal events between ancestral and derived areas, with colors matching with recipient areas. Upper boxes: different dispersal constraints at time intervals 0–10 mya and 10–30 mya, the former to simulate the effect of the land bridge formation between Central and South America, the latter restricted dispersal due to the absence of the land bridge; the cells in green indicate no restriction to dispersal, cells in gray indicate a reduction by half in dispersal capability, and cells in black do not allow dispersal. Timescale in millions of years before present (mya).

Morphology and morphometricsEdit

Our study of Bassaricyon taxonomy originally began with close examination of craniodental traits of museum specimens, which quickly revealed to the first author the existence of Bassaricyon neblina sp. n., which is highly distinctive morphologically. Close examinations of skins and skulls revealed clear differences in qualitative traits, and in external and craniodental measurements and proportions, between the four principal Bassaricyon lineages identified in this paper (which we recognize taxonomically as Bassaricyon neblina sp. n., Bassaricyon gabbii, Bassaricyon alleni, and Bassaricyon medius; Figures 3–5). Externally, these especially include differences in body size, pelage coloration, pelage length, relative length of the tail, and relative size of the ears (Figure 3, Table 5). Craniodentally, these especially include differences in skull size, relative size of the premolars and molars, configuration of molar cusps, relative size of the auditory bullae and external auditory meati, and the shape of the postdental palatal shelf (Figures 4–5, Tables 3–4). These and other differences are discussed in greater detail in the species accounts provided later in the paper.

File:Taxonomic-revision-of-the-olingos-(Bassaricyon)-with-description-of-a-new-species-the-Olinguito-ZooKeys-324-001-g003.jpg
Illustrations of the species of Bassaricyon. From top to bottom, Bassaricyon neblina sp. n. (Bassaricyon neblina ruber subsp. n. of the western slopes of the Western Andes of Colombia), Bassaricyon medius (Bassaricyon medius orinomus of eastern Panama), Bassaricyon alleni (Peru), and Bassaricyon gabbii (Costa Rica, showing relative tail length longer than average). Artwork by Nancy Halliday.
 
Skulls of adult male Bassaricyon. From left to right: Bassaricyon gabbii (USNM 324293, Cerro Punta, 1700 m, Chiriqui Mountains, Panama); Bassaricyon medius medius (MVZ 124112, Dagua, 1800 m, Colombia); Bassaricyon alleni (FMNH 65789, Chanchamayo, 1200 m, Junin, Peru); Bassaricyon neblina osborni (FMNH 88476, Munchique, 2000 m, Cauca, Colombia). Scale bar = 50 mm.
 
Skulls of adult female Bassaricyon. From left to right: Bassaricyon gabbii (AMNH 140334, Lajas Villa, Costa Rica); Bassaricyon medius orinomus (AMNH 37797, Puerta Valdivia, Antioquia District, Colombia); Bassaricyon alleni (FMNH 86908, Santa Rita, Rio Nanay, Maynas, Loreto Region, Peru); Bassaricyon neblina hershkovitzi (FMNH 70727, San Antonio, Agustin, Huila District, Colombia). Scale bar = 50 mm.

Table 3.Edit

"Cranial measurements for olingo species (compiled separately by sex). For each measurement, means are provided, ± standard deviation, with ranges in parentheses."
Bassaricyon gabbii n= 11 ♂♂, 11 ♀♀Bassaricyon medius n= 18 ♂♂, 27 ♀♀Bassaricyon alleni n= 12 ♂♂, 17 ♀♀Bassaricyon neblina n= 10 ♂♂, 9 ♀♀
CBL♂♂80.8 ± 1.50 (78.1 - 83.0)79.4 ± 2.67 (74.5 - 85.1)79.4 ± 1.81 (76.5 - 82.8)74.5 ± 3.26 (70.1 - 79.5)
♀♀78.2 ± 1.75 (75.0 - 80.2)77.3 ± 2.70 (70.8 - 82.3)77.0 ± 2.24 (73.1 - 80.5)75.1 ± 1.49 (72.9 - 77.9)
ZYG♂♂55.2 ± 2.76 (49.5 - 58.7)52.0 ± 2.66 (48.3 - 56.7)51.6 ± 1.02 (49.0 - 52.8)50.1 ± 3.02 (46.2 - 54.4)
♀♀51.3 ± 1.90 (48.1 - 54.4)50.0 ± 2.50 (44.4 - 54.0)50.2 ± 0.99 (48.6 - 52.2)49.0 ± 2.69 (44.6 - 53.0)
BBC♂♂36.1 ± 0.86 (34.3 - 37.6)35.1 ± 1.16 (32.9 - 37.5)35.4 ± 0.80 (34.2 - 36.8)34.6 ± 1.62 (32.4 - 37.5)
♀♀35.7 ± 1.34 (33.1 - 37.5)34.6 ± 1.20 (32.0 - 37.2)34.9 ± 0.91 (33.3 - 36.8)34.2 ± 1.62 (31.0 - 36.6)
HBC♂♂28.7 ± 0.88 (26.4 - 29.7)27.6 ± 0.84 (26.5 - 29.3)27.4 ± 0.73 (26.2 - 28.5)27.4 ± 0.61 (26.5 - 28.3)
♀♀27.9 ± 0.74 (26.9 - 28.8)26.9 ± 0.90 (25.4 - 28.5)26.9 ± 0.63 (26.0 - 28.1)26.5 ± 0.93 (24.9 - 27.8)
MTR♂♂28.5 ± 0.50 (27.8 - 29.3)28.6 ± 0.87 (27.0 - 30.4)28.4 ± 0.83 (26.5 - 29.5)26.5 ± 1.38 (24.5 - 28.7)
♀♀27.3 ± 1.02 (26.0 - 29.0)27.7 ± 0.90 (25.6 - 29.1)27.3 ± 0.69 (26.1 - 28.5)26.9 ± 0.88 (25.8 - 28.3)
CC♂♂18.7 ± 1.12 (17.2 - 20.4)16.4 ± 0.92 (15.0 - 17.9)16.8 ± 0.51 (15.8 - 17.6)15.9 ± 0.94 (14.7 - 17.1)
♀♀16.9 ± 0.76 (15.6 - 17.9)15.7 ± 0.80 (14.5 - 17.2)15.9 ± 0.55 (14.8 - 16.8)15.7 ± 0.47 (14.9 - 16.4)
WPP♂♂11.3 ± 1.27 (9.0 - 12.9)10.3 ± 0.95 (8.4 - 12.1)10.4 ± 0.82 (8.7 - 11.8)11.7 ± 1.05 (10.6 - 14.0)
♀♀10.7 ± 0.99 (9.3 - 12.7)10.3 ± 0.90 (9.0 - 13.0)9.9 ± 0.89 (8.2 - 11.7)11.6 ± 0.87 (10.5 - 12.7)
LPP♂♂12.3 ± 0.99 (10.7 - 14.0)10.2 ± 0.88 (7.9 - 11.7)10.8 ± 1.21 (9.3 - 12.9)11.2 ± 1.24 (9.2 - 12.7)
♀♀10.8 ± 0.77 (9.7 - 12.0)10.1 ± 0.90 (8.1 - 11.8)10.4 ± 0.67 (8.7 - 11.6)11.1 ± 0.82 (9.7 - 12.3)
LAB♂♂13.8 ± 0.63 (12.9 - 14.7)14.0 ± 0.81 (12.8 - 15.6)15.1 ± 0.76 (14.1 - 16.8)11.8 ± 0.76 (10.9 - 13.3)
♀♀13.8 ± 0.67 (12.9 - 14.8)14.0 ± 0.80 (12.6 - 15.2)14.4 ± 0.81 (13.0 - 15.6)12.2 ± 0.51 (11.0 - 12.7)
EAM♂♂3.6 ± 0.47 (2.6 - 4.2)3.9 ± 0.33 (3.4 - 4.5)3.8 ± 0.40 (3.2 - 4.5)2.9 ± 0.22 (2.5 - 3.1)
♀♀3.6 ± 0.39 (3.0 - 4.2)3.9 ± 0.30 (3.5 - 4.7)3.8 ± 0.36 (3.2 - 4.4)3.2 ± 0.33 (2.6 - 3.5)

Table 4.Edit

"Selected dental measurements of olingo species. For each measurement, means are provided, ± standard deviation, with ranges in parentheses."
Bassaricyon gabbii n= 22Bassaricyon medius n= 45Bassaricyon alleni n= 34Bassaricyon neblina n= 19
p1 width1.7 ± 0.17 (1.4 - 2.1)1.7 ± 0.13 (1.4 - 2.0)1.7 ± 0.12 (1.5 - 1.9)1.6 ± 0.13 (1.4 - 1.8)
p2 width2.4 ± 0.24 (2.0 - 2.8)2.2 ± 0.18 (1.8 - 2.6)2.2 ± 0.15 (1.9 - 2.5)2.1 ± 0.17 (1.9 - 2.5)
p3 width2.7 ± 0.21 (2.3 - 3.0)2.5 ± 0.18 (2.2 - 2.9)2.6 ± 0.16 (2.2 - 2.9)2.4 ± 0.22 (2.1 - 2.9)
p4 width3.4 ± 0.27 (3.0 - 3.9)3.2 ± 0.18 (2.8 - 3.6)3.4 ± 0.21 (2.8 - 3.7)3.3 ± 0.15 (3.0 - 3.7)
P2 width2.4 ± 0.24 (2.1 - 2.9)2.3 ± 0.19 (1.9 - 2.8)2.2 ± 0.17 (1.9 - 2.7)2.1 ± 0.19 (1.8 - 2.5)
P3 width2.9 ± 0.22 (2.5 - 3.3)3.0 ± 0.29 (2.5 - 3.6)3.0 ± 0.22 (2.6 - 3.5)2.9 ± 0.21 (2.6 - 3.4)
P4 length4.4 ± 0.24 (3.9 - 4.8)4.2 ± 0.27 (3.6 - 4.9)4.2 ± 0.20 (3.8 - 4.6)4.5 ± 0.24 (4.1 - 4.9)
P4 width5.1 ± 0.35 (4.5 - 5.6)4.7 ± 0.26 (4.2 - 5.4)4.8 ± 0.23 (4.4 - 5.6)5.0 ± 0.40 (4.5 - 5.9)
M1 length5. 0 ± 0.27 (4.4 - 5.4)5.0 ± 0.29 (4.3 - 5.6)5.1 ± 0.21 (4.6 - 5.5)5.3 ± 0.35 (4.8 - 6.1)
M1 width5.5 ± 0.30 (4.7 - 5.9)5.3 ± 0.32 (4.7 - 5.9)5.5 ± 0.28 (4.9 - 6.0)5.8 ± 0.31 (5.4 - 6.4)
M2 length3.7 ± 0.32 (2.8 - 4.1)4.0 ± 0.25 (3.2 - 4.4)3.8 ± 0.27 (3.3 - 4.4)3.8 ± 0.35 (3.3 - 4.4)
M2 width4.6 ± 0.38 (4.0 - 5.3)4.7 ± 0.27 (4.1 - 5.2)4.7 ± 0.28 (4.0 - 5.2)4.8 ± 0.24 (4.4 - 5.4)
m1 length5.6 ± 0.31 (5.0 - 6.3)5.7 ± 0.26 (4.9 - 6.2)5.6 ± 0.22 (5.2 - 6.0)5.8 ± 0.29 (5.4 - 6.3)
m1 width4.3 ± 0.29 (3.8 - 4.9)4.3 ± 0.21 (3.9 - 4.7)4.3 ± 0.23 (3.7 - 4.8)4.8 ± 0.22 (4.5 - 5.3)
m2 length4.8 ± 0.25 (4.4 - 5.3)5.1 ± 0.36 (4.2 - 5.7)4.8 ± 0.25 (4.4 - 5.4)5.0 ± 0.35 (4.4 - 5.6)
m2 width3.8 ± 0.24 (3.3 - 4.2)3.7 ± 0.24 (3.2 - 4.2)3.7 ± 0.19 (3.3 - 4.0)3.8 ± 0.17 (3.5 - 4.1)

Table 5.Edit

"External measurements of olingo species. For each measurement, means are provided, ± standard deviation, with ranges in parentheses."
Bassaricyon gabbii n= 13Bassaricyon medius n= 36Bassaricyon alleni n= 27Bassaricyon neblina n= 19
TL873 ± 54.8 (785 - 970)819 ± 60.5 (680 - 905)842 ± 50.6 (705 - 985)745 ± 33.7 (660 - 820)
Tail445 ± 40.3 (400 - 521)441 ± 44.6 (350 - 520)450 ± 28.8 (401 - 530)390 ± 21 (335 - 424)
HF84 ± 8.7 (65 - 100)81 ± 7.3 (58 - 92)81 ± 5.8 (70 - 92)76 ± 6.9 (60 - 86)
Ear36 ± 4.7 (25 - 44)37 ± 5.4 (25 - 44)37 ± 3.4 (30 - 43)34 ± 4.3 (25 - 39)
Mass (g)1382 ± 165 (1136 - 1580)1076 ± 71.6 (915 - 1200)1336 ± 152 (1100 - 1500)872 ± 169 (750 - 1065)
HB428 ± 27.9 (373 - 470)379 ± 23.2 (310 - 415)391 ± 29.3 (304 - 455)355 ± 21.1 (325 - 400)
Tail/HB1.04 ± 0.1 (0.9 - 1.2)1.16 ± 0.1 (1.0 - 1.4)1.15 ± 0.08 (1.0 - 1.3)1.10 ± 0.08 (1.0 - 1.2)

Principal component analyses of cranial and dental measurements support our molecular results in clearly identifying a fundamental morphometric separation between the Olinguito (Bassaricyon neblina sp. n.) and all other Bassaricyon taxa, in separate comparisons involving both males and females (Figures 6–7, Appendix 1). When first and second principal components are juxtaposed in a bivariate plot, Olinguito specimens demonstrate clear morphometric separation from all other Bassaricyon, despite overlap between these clusters in body size (as indicated by overlap in the first principal component, on which all or most variables in the analysis show positive [males] or negative [females] loadings). Despite smaller average body size compared to other Bassaricyon, the morphometric distinctness of Olinguito specimens is reflected not especially in small size but rather primarily by separation along the second principal component, indicating trenchant differences in overall shape and proportion, especially reflecting consistent differences in the molars, auditory bullae, external auditory meati, and palate, in which the Olinguito differs strongly and consistently from other Bassaricyon (Figures 6–7, Tables 3–4, Appendix 1).

 
Morphometric distinction between Olinguitos and other Bassaricyon, males. Morphometric dispersion (first two components of a principal component analysis) of 41 adult male Bassaricyon skulls based on 21 craniodental measurements (see Appendix 1, Table A1). The most notable morphometric distinction is between the Olinguito (blue circles) and all other Bassaricyon taxa. The plot also demonstrates substantial morphometric variability across geographic populations of the Olinguito, which we characterize with the description of four subspecies across different Andean regions. Symbols: blue circles (Bassaricyon neblina), green squares (Bassaricyon gabbii), yellow triangles (Bassaricyon alleni), orange diamonds (Bassaricyon medius medius), red diamonds (Bassaricyon medius orinomus).
 
Morphometric distinction between Olinguitos and other Bassaricyon, females. Morphometric dispersion (first two components of a principal component analysis) of 55 adult female Bassaricyon skulls based on 24 craniodental measurements (see Appendix 1, Table A2). The most notable morphometric distinction is between the Olinguito (blue circles) and all other Bassaricyon taxa. The plot also demonstrates substantial morphometric variability across geographic populations of the Olinguito, which we characterize with the description of four subspecies across different Andean regions. Symbols: blue circles (Bassaricyon neblina), green squares (Bassaricyon gabbii), yellow triangles (Bassaricyon alleni), orange diamonds (Bassaricyon medius medius), red diamonds (Bassaricyon medius orinomus).

The lower elevation olingo taxa Bassaricyon gabbii, Bassaricyon medius, and Bassaricyon alleni are not separable in most principal component analyses of craniodental measurements (e.g., Figures 6–7), but discriminant function analyses of craniodental measurements (e.g., Figure 8, showing separation of male skulls) separates them into discrete clusterings with few misclassifications, and identifies some of the more important craniodental traits that help to distinguish between them (Appendix 1). These (and other, qualitative) craniodental distinctions are complemented by differences in pelage features and genetic divergences that we discuss below.

 
Morphometric distinction between species of Bassaricyon, excluding the Olinguito, adult males. Morphometric dispersion (first two variates of a discriminant function analysis) of 39 adult male Bassaricyon skulls based on 8 craniodental measurements (see Appendix 1, Table A3). Symbols: green squares (Bassaricyon gabbii), yellow triangles (Bassaricyon alleni), orange diamonds (Bassaricyon medius).

Because of marked and consistent differences in body size between the two regional populations of Bassaricyon medius (one distributed in western South America, the other primarily distributed in Panama), we choose to recognize these two as separate subspecies (Bassaricyon medius medius and Bassaricyon medius orinomus, respectively, Tables 6–7). The Olinguito likewise shows a clear pattern of geographic variation, with different regional populations in the Northern Andes showing consistent differences in craniodental size and morphology (Figures 9–10, Table 8, Appendix 1), as well as pelage coloration and length. We recognize four distinctive subspecies of the Olinguito throughout its recorded distribution, as discussed in the description of Bassaricyon neblina sp. n., below. Two of these subspecies are included in our genetic comparisons; genetic comparisons involving the remaining two subspecies remain a goal for the future.

Table 6.Edit

"Cranial measurements for the two subspecies of Bassaricyon medius. For each measurement, means are provided, ± standard deviation, with ranges in parentheses."
Bassaricyon medius mediusBassaricyon medius orinomus
W Colombia, W EcuadorC Panama to N Colombia
n = 5 ♂♂, 7 ♀♀n = 12 ♂♂, 17 ♀♀
CBL♂♂77.2 ± 1.81 (74.5 - 78.8)80.3 ± 2.50 (76.2 - 85.1)
♀♀75.4 ± 1.65 (72.4 - 76.7)78.8 ± 1.72 (75.5 - 82.3)
ZYG♂♂50.2 ± 1.14 (48.9 - 51.2)53.0 ± 2.57 (48.9 - 56.7)
♀♀48.5 ± 1.69 (46.5 – 51.0)51.2 ± 1.98 (47.4 – 54.0)
BBC♂♂34.0 ± 0.80 (32.9 - 34.8)35.6 ± 0.98 (34.0 - 37.5)
♀♀34.4 ± 0.41 (33.7 – 35.0)35.0 ± 1.15 (32.8 - 37.2)
HBC♂♂28.2 ± 1.06 (27.1 - 29.3)27.4 ± 0.62 (26.6 - 28.3)
♀♀26.8 ± 0.89 (26.1 - 28.5)27.0 ± 0.89 (25.4 - 28.5)
MTR♂♂28.5 ± 0.97 (27.3 - 29.8)28.7 ± 0.90 (27.0 - 30.4)
♀♀27.1 ± 0.78 (25.6 - 27.9)28.0 ± 0.77 (26.4 - 29.1)
CC♂♂15.9 ± 0.69 (15.1 - 17.0)16.7 ± 0.94 (15.0 - 17.9)
♀♀15.0 ± 0.46 (14.5 - 15.8)16.1 ± 0.71 (14.6 - 17.2)
WPP♂♂9.7 ± 0.95 (8.4 - 10.8)10.6 ± 0.91 (8.6 - 12.1)
♀♀10.0 ± 0.57 (9.1 - 10.6)10.3 ± 1.04 (9.0 - 13.0)
LPP♂♂9.4 ± 1.03 (7.9 - 10.6)10.5 ± 0.64 (9.8 - 11.7)
♀♀9.8 ± 0.84 (8.9 - 11.3)10.2 ± 1.01 (8.1 - 11.8)
LAB♂♂13.6 ± 0.72 (12.8 - 14.6)14.2 ± 0.84 (13.1 - 15.6)
♀♀13.4 ± 0.45 (12.6 - 13.9)14.3 ± 0.73 (12.8 - 15.2)
EAM♂♂3.9 ± 0.47 (3.4 - 4.5)3.9 ± 0.27 (3.5 - 4.4)
♀♀3.9 ± 0.34 (3.5 - 4.4)3.9 ± 0.28 (3.6 - 4.7)

Table 7.Edit

"External measurements for the two subspecies of Bassaricyon medius. For each measurement, means are provided, ± standard deviation, with ranges in parentheses."
Bassaricyon medius medius W Colombia, W Ecuador n= 12Bassaricyon medius orinomus C Panama to N Colombia n= 24
TL754 ± 49.7 (680 - 819)844 ± 42.9 (770 - 905)
Tail392 ± 29.1 (350 - 435)460 ± 33.6 (400 - 520)
HF73 ± 5.4 (58 - 79)85 ± 3.5 (77 - 92)
Ear32 ± 4.8 (25 - 40)39 ± 4 (30 - 44)
Mass (g)1058 ± 146 (915 - 1200)1090 ± 19.2 (1050 - 1100)
HB362 ± 29.5 (310 - 415)385 ± 17.2 (355 - 410)
Tail/HB1.1 ± 0.09 (0.97 - 1.24)1.2 ± 0.08 (1.04 - 1.35)
 
Morphometric distinction between Olinguito subspecies. Both sexes combined. Morphometric dispersion (first two components of a principal component analysis) of 17 adultskulls based on 13 cranial measurements (see Appendix 1, Table A4). (Dental measurements also discretely partition these subspecies in a separate principal component analysis, not shown.) Black dots = Bassaricyon neblina neblina; gray triangles = Bassaricyon neblina osborni; red diamonds = Bassaricyon neblina ruber; blue squares = Bassaricyon neblina hershkovitzi.
 
Skulls of Olinguito subspecies. From left to right: Bassaricyon neblina neblina (AMNH 66753, holotype, old adult female, Las Maquinas, Ecuador); Bassaricyon neblina osborni (FMNH 88476, holotype, adult male, Munchique, 2000 m, Cauca Department, Colombia); Bassaricyon neblina hershkovitzi (FMNH 70724, paratype, adult male, San Antonio, Agustin, Huila District, Colombia); Bassaricyon neblina ruber (FMNH 70723, paratype, adult male, Guapantal, 2200 m, Urrao, Antioquia Department, Colombia). Scale bar = 50 mm.

Table 8.Edit

"Dental and cranial measurements of Olinguito (Bassaricyon neblina) subspecies. For each measurement, means are provided, ± standard deviation, with ranges in parentheses."
Bassaricyon neblina ruber n= 3Bassaricyon neblina hershkovitzi n= 4Bassaricyon neblina osborni n= 8Bassaricyon neblina neblina n= 4
p1 width1.4 ± 0.06 (1.4 - 1.5)1.5 ± 0.12 (1.4 - 1.6)1.6 ± 0.09 (1.6 - 1.8)1.7 ± 0.11 (1.5 - 1.8)
p2 width2.1 ± 0.14 (1.9 - 2.2)1.9 ± 0.06 (1.9 – 2.0)2.2 ± 0.15 (2.0 - 2.5)2.2 ± 0.17 (2.1 - 2.4)
p3 width2.4 ± 0.08 (2.3 - 2.5)2.2 ± 0.06 (2.1 - 2.2)2.5 ± 0.16 (2.4 - 2.8)2.4 ± 0.32 (2.2 - 2.9)
p4 width3.3 ± 0.11 (3.2 - 3.4)3.1 ± 0.12 (3.0 - 3.3)3.4 ± 0.13 (3.2 - 3.7)3.4 ± 0.09 (3.3 - 3.5)
P2 width2.0 (2.0 – 2.0)1.9 ± 0.05 (1.8 – 2.0)2.2 ± 0.17 (2.1 - 2.5)2.3 ± 0.15 (2.2 - 2.5)
P3 width2.9 ± 0.17 (2.7 - 3.1)2.7 ± 0.10 (2.6 - 2.8)3.0 ± 0.19 (2.8 - 3.4)3.1 ± 0.15 (2.9 - 3.3)
P4 length4.3 ± 0.21 (4.1 - 4.5)4.2 ± 0.13 (4.1 - 4.3)4.5 ± 0.17 (4.3 - 4.8)4.7 ± 0.17 (4.5 - 4.9)
P4 width4.6 ± 0.14 (4.5 - 4.8)5.0 ± 0.23 (4.8 - 5.3)4.9 ± 0.20 (4.6 - 5.1)5.7 ± 0.13 (5.6 - 5.9)
M1 length5.0 ± 0.12 (5.0 - 5.2)5.0 ± 0.25 (4.8 - 5.4)5.3 ± 0.23 (5.0 - 5.6)5.7 ± 0.4 (5.2 - 6.1)
M1 width5.5 ± 0.14 (5.4 - 5.6)5.5 ± 0.10 (5.4 - 5.6)5.8 ± 0.20 (5.5 - 6.1)6.2 ± 0.13 (6.1 - 6.4)
M2 length3.6 ± 0.22 (3.5 - 3.9)3.5 ± 0.16 (3.3 - 3.7)4.1 ± 0.29 (3.6 - 4.4)3.9 ± 0.4 (3.3 - 4.2)
M2 width4.5 ± 0.13 (4.4 - 4.6)4.7 ± 0.03 (4.7 - 4.8)4.8 ± 0.20 (4.6 - 5.2)4.9 ± 0.3 (4.7 - 5.4)
m1 length5.5 ± 0.05 (5.4 - 5.5)5.8 ± 0.21 (5.6 – 6.0)5.8 ± 0.18 (5.6 – 6.0)6.2 ± 0.03 (6.2 - 6.3)
m1 width4.7 ± 0.12 (4.6 - 4.8)4.8 ± 0.17 (4.7 – 5.0)4.8 ± 0.26 (4.5 - 5.3)5.0 ± 0.22 (4.7 - 5.2)
m2 length4.7 ± 0.39 (4.4 - 5.1)5.0 ± 0.37 (4.5 - 5.2)5.2 ± 0.26 (4.9 - 5.6)4.8 ± 0.22 (4.5 - 5.1)
m2 width3.7 ± 0.09 (3.6 - 3.8)3.7 ± 0.19 (3.5 - 3.9)3.9 ± 0.10 (3.7 - 4.0)3.9 ± 0.16 (3.7 - 4.1)
CBL73.0 ± 0.58 (72.4 - 73.5)71.4 ± 1.13 (70.1 - 72.9)76.6 ± 1.64 (75.1 - 79.5)75.9 ± 1.4 (74.6 - 77.9)
ZYG51.1 ± 2.28 (48.9 - 53.4)46.7 ± 0.60 (46.2 - 47.5)51.7 ± 1.73 (49.1 - 54.4)46.9 ± 1.59 (44.6 - 48)
BBC36.0 ± 1.44 (34.7 - 37.5)32.9 ± 0.54 (32.4 - 33.6)35.1 ± 0.90 (33.9 - 36.6)33.2 ± 1.62 (31.0 - 34.9)
HBC27.7 ± 0.55 (27.2 - 28.3)27.6 ± 0.38 (27.1 - 27.9)27.2 ± 0.58 (26.5 - 28.2)25.8 ± 0.63 (24.9 - 26.2)
MTR25.9 ± 0.22 (25.7 - 26.1)25.1 ± 0.56 (24.5 - 25.8)27.4 ± 0.78 (26.0 - 28.7)27.5 ± 0.56 (27 - 28.3)
CC15.7 ± 0.52 (15.4 - 16.3)14.9 ± 0.15 (14.7 – 15.0)16.4 ± 0.54 (15.5 - 17.1)15.6 ± 0.25 (15.4 - 15.9)
WPP12.1 ± 0.25 (11.8 - 12.3)11.8 ± 1.54 (10.6 – 14.0)11.8 ± 0.74 (10.8 - 12.8)10.9 ± 0.8 (10.5 - 12.1)
LPP10.9 ± 0.54 (10.3 - 11.4)9.7 ± 0.34 (9.2 - 9.9)11.9 ± 0.56 (11.0 - 12.7)11.2 ± 1.05 (9.7 - 12.3)
LAB11.7 ± 0.38 (11.4 - 12.1)11.2 ± 0.40 (10.9 - 11.8)12.3 ± 0.60 (11.2 - 13.3)12.5 ± 0.18 (12.3 - 12.7)
EAM2.7 (2.7 - 2.7)3.2 ± 0.16 (3.1 - 3.4)2.9 ± 0.29 (2.5 - 3.3)3.4 ± 0.05 (3.4 - 3.5)

Bioclimatic range modelingEdit

Distribution models for all species are judged to have performed well based on their high values for ‘area under the curve’ (AUC) and unregularized test gain (Table 9), as well as their fit of the final prediction to the locality data (Figures 11–12). There was relatively low impact of withholding test data from these models, as indicated by the low Mean Test AUC values. These values are lowest for Bassaricyon alleni, probably reflecting its larger distribution relative to the variation of environmental data ([119]). The strongest environmental predictors for Bassaricyon neblina sp. n. were seasonal variation in temperature (suitability declines with higher variation, after sharp threshold) and the temperature of the wettest quarter (negative relationship). The annual range of temperatures was the most important predictor for the Bassaricyon gabbii and Bassaricyon medius distributions (both sharp negative relationships). Bassaricyon alleni was the only one of the four species to have an ecological biome ranked as one of the top predictors (Tropical Moist Broadleaf Forests as highly suitable).

Table 9.Edit

"Performance of bioclimatic distribution models for four Bassaricyon species using vouchered specimen localities. Mean values are averages of 10 models run, each withholding 20% of data as test localities, while the Full Model AUC used all available data. The mean value for equal training sensitivity and specificity was used as a logistic threshold to create a range map predicting presence/absence."
LocalitiesMean Test AUC (stdev)Full Model AUCMean Unregularized Training GainMean equal training sensitivity and specificity (logistic threshold)
Bassaricyon alleni430.901 (0.036)0.9391.850.302
Bassaricyon gabbii180.977 (0.012)0.9934.090.222
Bassaricyon medius310.952 (0.028)0.9883.760.119
Bassaricyon neblina160.996 (0.002)0.9984.770.160
 
Bioclimatic distribution models and localities for Bassaricyon species. Models from MAXENT using all vouchered occurrence records, 19 bioclimatic variables, and one potential habitat variable.
 
Predicted distribution for Bassaricyon species based on bioclimatic models. To create these binary maps we used the average minimum training presence for 10 test models as our cutoff. In addition, we excluded areas of high probability that were outside of the known range of the species if they were separated by unsuitable habitat.

The full Maxent distribution models predict the suitability of habitat across South and Central America (Figure 11). To make the binary prediction maps (Figure 12) we excluded areas with high probability that were disjunct from areas where specimens have been recorded (e.g., western Venezuela excluded from the map for Bassaricyon neblina sp. n., central and eastern Brazil excluded from the Bassaricyon alleni map, northern Central America excluded from the Bassaricyon medius map, South America excluded from the Bassaricyon gabbii map). For Bassaricyon neblina sp. n. we excluded areas of high probability from the Eastern Cordillera of Colombia and the Andes of southern Ecuador and northern Peru because of the lack of specimens. Likewise, predicted suitable habitat for Bassaricyon gabbii in northern Central America (Honduras, Guatemala) remains unverified by specimen data. Although there are two recent unconfirmed records in the region ([125]), the specific locations of these sightings did not fall in areas predicted as suitable habitat by our models. Finally, the exact area of transition between Bassaricyon gabbii and Bassaricyon medius in Panama remains unclear. All of these regions should be considered high priority areas for future surveys, especially areas identified as potential Bassaricyon neblina sp. n. habitat (see Discussion, below).

The range of Bassaricyon neblina sp. n. is typical of many Andean species in being restricted to wet cloud forest habitats, which are limited in area and also under heavy development pressure. In comparing recent land use ([126]) of suitable historical Bassaricyon neblina habitat, we found that 42% of suitable habitats have been converted to agriculture or urban areas, and 21% remain in natural but largely unforested conditions. Thus we predict that only 37% (40,760 km2) of appropriate Olinguito habitats remain forested.

SystematicsEdit

Bassaricyon neblina sp. n.Edit

http://zoobank.org/94DDB038-2111-44D1-A940-766BF8F15E51

http://species-id.net/wiki/Bassaricyon_neblina

Holotype.Edit

We designate as the holotype of neblina specimen number 66753 in the mammalogy collection of the American Museum of Natural History, New York, a skin and complete skull of an old adult female, from Las Máquinas (= Las Machinas [see [117], circa00°32’S, 78°39’W, 2130 m), Pichincha Province, Ecuador, collected 21 September 1923 by G.H.H. Tate.

Referred specimens.Edit

QCAZ 0159, partial skin, Otonga Reserve, 1800 m, Cotopaxi Province, Ecuador; MECN 2177, adult female, skin and skull, La Cantera 2300 m, Cotopaxi Province, Ecuador; QCAZ 8661, young adult female, skin, skull, and postcranial skeleton, Otonga Reserve, 2100 m, Cotopaxi Province, Ecuador (collected by K. Helgen et al., August 2006); QCAZ 8662, young adult female, skin, skull, and postcranial skeleton, [“forested gully near”] La Cantera, 2260 m, Cotopaxi Province, Ecuador (collected by M. Pinto et al., August 2006). We have also seen photographs of this species from Tandayapa, 2350 m, Pichincha Province (Figure 13).

 
The Olinguito, Bassaricyon neblina neblina, in life, in the wild. Taken at Tandayapa Bird Lodge, Ecuador (for mammalogical background of Tandayapa, see [127]). Photograph by Mark Gurney.

Below, we identify additional referred specimens when we describe three additional subspecies of Bassaricyon neblina from the cordilleras of Colombia (Figures 9–10, 13–16).

 
Olinguito skins from different regions of the Colombian Andes. Left, Bassaricyon neblina ruber, of the western slopes of the Western Andes of Colombia (FMNH 70722, adult male); Middle, Bassaricyon neblina hershkovitzi, of the eastern slopes of the Central Andes of Colombia (FMNH 70727, adult female); Right, Bassaricyon neblina osborni,of the eastern slopes of the Western Andes and eastern slopes of the Central Andes of Colombia (FMNH 90052, adult female).
 
The Olinguito, Bassaricyon neblina osborni, in life. Photograph taken in captivity, at the Louisville Zoo (see [59]). This animal, named “Ringerl”, was received as an adult in 1967 from the mountains of Colombia near Cali, and exhibited in various zoos, including the National Zoo in Washington, D.C. (see text). Photographs by I. Poglayen-Neuwall, previously unpublished (additional photographs published by [59]).
 
Distributions (localities) of the four Olinguito subspecies in the Andes of Colombia and Ecuador.

Diagnosis.Edit

Bassaricyon neblina can be easily identified on the basis of both external and craniodental characteristics (Figures 3–7, Tables 3–5). It differs from other Bassaricyon in its smaller body and cranial size; longer, denser, and more richly coloured dorsal pelage (black-tipped, tan to strikingly orange- to reddish-brown); indistinctly banded, bushier, and proportionally shorter tail (at least compared to the lowland olingos, Bassaricyon alleni and Bassaricyon medius, Table 5); (externally) more rounded face with a blunter, less tapering muzzle; smaller and more heavily furred external ears, and considerably reduced auditory bullae, with a markedly smaller external auditory meatus; broadened and more elongate postdental palate (‘palatal shelf’), bearing more prominent lateral ‘flanges’ (sometimes developed to the point where it nearly closes off the “palatal notch” sensu[128]); and proportionally much larger first molars (M1and m1), achieved especially by the development of more massive and bulbous principal molar cusps (protocone, paracone, metacone, hypocone) in M1, and for m1 by the widening of the talonid with the expansion in particular of the entoconid and hypoconid. The m1paraconid is reduced relative to other Bassaricyon.

Where Bassaricyon medius and Bassaricyon neblina occur in regional sympatry on the western slopes of the Andes, Bassaricyon neblina is smaller and more richly rufous and/or blackish in coloration, and is distinguished by all of the characteristics noted above. Externally, Bassaricyon neblina can only be confused with the highest elevation populations of Bassaricyon alleni, from forests above 1000 m on the eastern slopes of the Andes (specimens from Pozuzo and Chanchamayo in Peru), which, like Bassaricyon neblina, also have long, black-tipped dorsal pelage (though not so strongly rufous as in Bassaricyon neblina), ears that are especially furry (though not so small as in Bassaricyon neblina), and tails averaging slightly shorter than in lowland populations of Bassaricyon alleni (but not as short as in Bassaricyon neblina). The craniodental characteristics of Bassaricyon neblina (especially of the palate, bullae, and molars) are unmistakable.

Etymology.Edit

The specific epithet neblina (Spanish, “fog or mist”), a noun in apposition, references the cloud forest habitat of the Olinguito.

Distribution.Edit

The recorded distribution of Bassaricyon neblina comprises humid montane rainforests (“cloud forests”) from 1500 m to 2750 m in the Northern Andes, specifically along the western and eastern slopes of the Western Andes of Colombia and Ecuador, and along the western and eastern slopes of the Central Andes of Colombia (Figure 16). Bassaricyon neblina occurs in regional sympatry with Bassaricyon medius medius on the western slopes of the Ecuadorian Andes, where we have encountered the two species at localities less than 5 km apart. On the basis of our museum and field research, we document Bassaricyon neblina from 16 localities (representing 19 elevational records) in the Western Andes of Ecuador and the Western and Central Andes of Colombia. All sites are situated between 1500 and 2750 m (mean 2100 m, median 2130 m, ± 280 s.d.) and are associated with humid montane forest (“cloud forest”, [129]). We used bioclimatic modeling to predict the global geographic distribution of Bassaricyon neblina, which comprises wet, forested ecoregions typical of the habitats where Olinguitos have been recorded (Figures 11–12). As noted above, of the entire land area predicted to be suitable for Olinguito occurrence, 42% has been converted to agriculture or urban areas and 21% comprises other unforested landscapes; only 37% (40,760 km2) of this land area is currently forested.

Geographic variation.Edit

Geographic variation in the Olinguito is remarkable, reflecting consistent regional differences in color, size, and craniodental features associated with differential distributions in disjunct areas of the Andes. This is unsurprising given that the montane forests of the Central and Western Cordilleras of the Northern Andes are a region where major evolutionary differentiation has unfolded in many endemic Andean vertebrate groups (e.g., [130], [131], [118], [132]). Below we diagnose four distinctive subspecies of Bassaricyon neblina and describe their geographic ranges as so far understood.

Subspecies ofBassaricyon neblinaEdit

Bassaricyon neblina neblina subsp. n.Edit

http://species-id.net/wiki/Bassaricyon_neblina_neblina

(western slopes of Western Andes of Ecuador)

Diagnosis.Edit

This subspecies is (in skull length) smaller than Bassaricyon neblina osborni subsp. n., but larger than Bassaricyon neblina hershkovitzi subsp. n. and Bassaricyon neblina ruber subsp. n. (though Bassaricyon neblina ruber subsp. n. is more robust cranially, with a wider skull). It has proportionally very large teeth, especially P4 and the first molars, and a narrow skull, with a narrow and low-domed braincase (Figures 9–10, Table 8). In color it most closely resembles Bassaricyon neblina osborni subsp. n., but is the least rufous of the subspecies, usually with the greatest preponderance of black tipping to the fur (e.g., Figure 13).

Distribution.Edit

The nominate subspecies is endemic to Ecuador, where it is recorded from the western slopes of the Andes, in Pichincha and Cotopaxi Provinces, in forests at elevations from 1800 to 2300 m (Figure 16).

Referred specimens.Edit

As listed for Bassaricyon neblina, above.

Bassaricyon neblina osborni subsp. n.Edit

http://species-id.net/wiki/Bassaricyon_neblina_osborni

(eastern slopes of Western Andes and western slopes of Central Andes of Colombia)

Diagnosis.Edit

This is the largest subspecies of Bassaricyon neblina, with a short rostrum, widely splayed zygomata, wide rostrum and braincase, and very large molars and posterior premolars; the dorsal pelage is of moderate length, tan to orangish-brown in overall color, with prominent black and gold tipping, with a more grayish face and limbs, with the limbs bearing relatively short fur, and a tail usually grizzled with golden-brown fur tipping.

Distribution.Edit

This is the representative of Bassaricyon neblina on the eastern slopes of the Western Andes of Colombia (e.g., Castilla Mountains [AMNH]; Sabanetas [FMNH]; El Tambo [NMS]; the vicinity of Cali[59]; El Duende [69]; Gallera: “western slope of most eastern ridge of southern Western Andes” [AMNH, [112]) and the western slopes of the Central Andes of Colombia (Cerro Munchique [FMNH]). One specimen (AMNH 42351, from Santa Elena, Antioquia Department) derives from the eastern slopes of the Central Andes in northern Colombia (habitat described as “deforested, grassy, and bushy ([133])”; [112]); this shows that this subspecies also crosses to the eastern slopes of the Central Andes in Antioquia. Further south, in the department of Huila, the smaller subspecies Bassaricyon neblina hershkovitzi subsp. n. (see below) occurs on the eastern slopes of the Central Andes.

Records to date of Bassaricyon neblina osborni are from 1500 to at least 2750 m elevation in Cauca, Valle del Cauca, and Antioquia Departments of Colombia (Figure 16). Bassaricyon medius medius is also recorded from the Cauca Valley (east slopes of Western Andes and western slopes of Central Andes) at elevations up to at least 725 m (UV-3774: [69]; see account of Bassaricyon medius below), so these two taxa (Bassaricyon medius medius and Bassaricyon neblina osborni) are presumably regionally sympatric (and probably elevationally stratified) across the range of this Olinguito subspecies on the slopes of the Western and Central Andes.

Etymology.Edit

The name honors Henry Fairfield Osborn (1857–1935), paleontologist, faculty of Princeton and Columbia Universities, and Curator of Vertebrate Paleontology (1891–1909) and President (1909–1933) of the American Museum of Natural History ([134], [135]). “Bassaricyon osborni” is a manuscript name (never formally published) associated with a specimen of this taxon (AMNH 32609, with “Type” written on the skull), demonstrating a century-old intention, later discarded (probably by J.A. Allen or H.E. Anthony, see below), to name this taxon after Osborn. Here we validate this unpublished name as a newly described subspecies of Bassaricyon neblina, but we choose a more complete specimen than AMNH 32609, which has a damaged mandible and various broken teeth, as holotype.

Holotype.Edit

FMNH 88476, adult male, skin and skull, Munchique, 2000 m, Cauca Department, Colombia (collected by K. von Sneidern, 3 June 1957).

Paratypes.Edit

AMNH 32608, adult female, skin and skull, and AMNH 32609, adult male, skin and skull, Gallera ([136]; = “La Gallera” of [112]), 5000 feet (=1524 m), Cauca Department, Colombia (both collected by L. Miller, 13 July 1911); NMS A59-5083, adult female, skin and skull, El Tambo, 1700 m, Cauca Department, Colombia (collected by K. von Sneidern); FMNH 85818, adult male, skin and skull, Munchique, 2000 m, Cauca Department, Colombia (collected by K. von Sneidern, 19 January 1956); FMNH 89220, adult female, skin and skull, Sabanetas, 2000 m, Cauca Department, Colombia (collected by K. von Sneidern, 26 September 1957); FMNH 90052, adult female, skin and skull, Sabanetas, 1900 m, Cauca Department, Colombia (collected by K. von Sneidern, 12 February 1959).

Referred specimens.Edit

AMNH 14185, skin (skull not found), adult male, Castilla Mountains (“La Castilla” of [112]), Valle del Cauca Department (collected by J.H. Batty, 9 June 1898); AMNH 42351, adult male, skin and skull, Santa Elena, apparently at 9000 feet (= 2750 m), Antioquia Department, Colombia (collected by H. Niceforo Maria, 10 January 1919) ([112]); USNM 598996, adult male, skin, skull, and postcranial skeleton, from Colombia, specific locality unknown (received from Tulane University).

Bassaricyon neblina hershkovitzi subsp. n.Edit

http://species-id.net/wiki/Bassaricyon_neblina_hershkovitzi

(eastern slopes of Central Andes of Colombia)

Diagnosis.Edit

This is the smallest subspecies of Bassaricyon neblina, with the fur of the dorsum and tail very long, and richly orange-brown (brown with strong golden and black tipping) in coloration, and more golden brown face and limbs, with the limbs well-furred. The skull, braincase, and rostrum are especially narrowed, the posterior palatal shelf is extremely broad, and the molars are proportionally very large.

Distribution.Edit

This is the representative of Bassaricyon neblina on the eastern slopes of the Central Andes of southern Colombia (Figure 16). Records to date are from 2300 to 2400 m elevation in the vicinity of San Antonio (Huila Department), a forested locality “on eastern slope of Central Andes at headwaters of Rio Magdalena, near San Agustin” ([112]) (see [137]).

Etymology.Edit

The name honors American mammalogist Philip Hershkovitz (1909–1997), collector of the type series, Curator of Mammals at the Field Museum of Natural History (1947–1974; Emeritus Curator until 1997), and authority on South American mammals ([138], [139]).

Holotype.Edit

FMNH 70727, adult female, skin, skull, and postcranial skeleton, San Antonio, 2300 m, San Agustin, Huila Department, Colombia (collected by P. Hershkovitz, 6 September 1951) (see Figure 18).

Paratypes.Edit

FMNH 70724, adult male, skin, skull, and postcranial skeleton, San Antonio, 2400 m, San Agustin, Huila Department, Colombia (collected by P. Hershkovitz, 20 August 1951); FMNH 70725, adult male, skin, skull, and postcranial skeleton, San Antonio, 2400 m, San Agustin, Huila Department, Colombia (collected by P. Hershkovitz, 25 August 1951); FMNH 70726, adult male, skin, skull, and postcranial skeleton, San Antonio, 2300 m, San Agustin, Huila Department, Colombia (collected by P. Hershkovitz, 6 September 1951).

Bassaricyon neblina ruber subsp. n.Edit

http://species-id.net/wiki/Bassaricyon_neblina_ruber

(Urrao District, western slope of Western Andes of Colombia)

Diagnosis.Edit

This subspecies is markedly smaller (at least in skull length) than Bassaricyon neblina neblina and Bassaricyon neblina osborni, with the fur longest and most strikingly reddish of all the Olinguito populations (reddish with golden and black tipping), and more golden brown face and and reddish brown limbs, with the limbs well-furred. Though similar in overall skull length to Bassaricyon neblina hershkovitzi, the skull is especially wide for its size (Table 8), with broad zygomata, braincase, and rostrum compared to that subspecies.

Distribution.Edit

This subspecies is recorded from the Urrao District of Colombia (2200–2400 m in Huila and Antioquia Departments), on the western slope of the Western Andes, where it is documented by specimens collected in 1951 by Philip Hershkovitz.

Etymology.Edit

The name refers to the rich reddish-brown pelage of this subspecies (Figures 3, 14).

Holotype.Edit

FMNH 70722, adult male, skin, skull, and postcranial skeleton, Rio Urrao, 2400 m, Urrao, Huila Department, Colombia (collected by P. Hershkovitz, 24 April 1951).

Paratypes.Edit

FMNH 70721, adult female, skin, skull, and postcranial skeleton, Rio Ana, 2200 m, Urrao, Huila Department, Colombia (collected by P. Hershkovitz, 19 April 1951); FMNH 70723, adult male, skin, skull, and postcranial skeleton, Guapantal, 2200 m, Urrao, Antioquia Department, Colombia (collected by P. Hershkovitz, 28 April 1951).

Reproductive isolation and genetic divergence ofBassaricyon neblinaEdit

Information from sympatric occurrences and captive breeding demonstrates that the Olinguito, Bassaricyon neblina, is reproductively isolated from other species of Bassaricyon and clearly constitutes a distinct “biological species” (i.e., sensu[140], [141]).

In Ecuador we documented the Olinguito (Bassaricyon neblina neblina) in regional sympatry with the Western lowland olingo, Bassaricyon medius medius; we recorded the two species at localities less than 5 km apart (i.e., at Otonga and San Francisco de las Pampas) during fieldwork in August 2006. The ecogeographic relationship between the two species is probably one of elevational parapatry or limited elevational overlap along the western slopes of the Andes. Bassaricyon medius medius extends into the elevational range of Bassaricyon neblina,perhaps especially in areas where cloud forests have been cleared for human settlement, agriculture, and pastoralism (Figure 17).

 
Area of sympatric occurrence between Bassaricyon species in western Ecuador. Farmland cutting into cloud forest habitat at Las Pampas, approximately 1800 m, on the western slopes of the Western Andes, Ecuador, along the boundary of Otonga, a protected forest reserve. It is at this elevational and environmental boundary that Bassaricyon medius medius (lower elevations, including more anthropogenically disturbed habitats) and Bassaricyon neblina neblina (higher elevations, less disturbed forests) co-occur in regional sympatry on the western slopes of the Andes.
 
Type series of an Olinguito subspecies, Bassaricyon neblina hershkovitzi, in the field. Two Olinguito specimens (FMNH 70726, paratype of hershkovitzi, and FMNH 70727, holotype of hershkovitzi, along with a Long-tailed weasel, Mustela frenata, FMNH 70998) brought in by a local hunter, 6 September 1951, at San Antonio, San Agustín, Huila District, Colombia. Photo by P. Hershkovitz, courtesy of the Field Museum of Natural History.

Ingeborg Poglayen-Neuwall (pers comm. to R. Kays, 2006) informed us that an adult female zoo animal named “Ringerl” (Figure 15; also figured by [59]), which we can now identify as an Olinguito (Bassaricyon neblina osborni), was moved among several zoos during the 1970s because it would not successfully breed with other captive olingos (i.e., not Bassaricyon neblina), most of which were apparently Bassaricyon alleni (see [59]).

The Olinguito differs from congeners (Bassaricyon alleni, Bassaricyon medius, and Bassaricyon gabbii) by 9.6–11.3% in base-pair composition of the (mitochondrial) cytochrome b gene (Table 2), a level of divergence consistent with that separating biological species in many groups of mammals, including carnivores ([142]). For comparison with other procyonids, this level of genetic distinction is equivalent to the 10–11% divergence between Procyon lotor and Procyon cancrivorus, sympatrically-occurring raccoons traditionally classified in separate subgenera ([143], [144]), and comparable to the 9–13% divergence between Nasua narica and Nasuella olivacea ([145]), coatis traditionally classified in separate genera ([146], [10], [37], [38]).

Karyotype: The karyotype of an adult female Olinguito(Bassaricyon neblina osborni, then identified as “Bassaricyon gabbii”, with 2n = 38, as in all procyonids) was reported and discussed (but not described in detail) by [147], and figured by [148]. This was based on a captive animal originally captured from mountains in the vicinity of Cali in Colombia (Figure 15).

Description: The Olinguito is the smallest species of Bassaricyon, both in skull and body size (Tables 3, 5), and is thus, on average, the smallest living procyonid (matched only by small individuals of the Ringtail, Bassariscus astutus). The tail averages 10% longer than the head-body length (Table 5). The pinnae are proportionally much smaller in Bassaricyon neblina than in other Bassaricyon, appearing shorter and rounder, and standing out less conspicuously on the head; they are also more heavily furred and usually fringed with a paler, contrasting border of buffy or golden fur. The dorsal fur is dense, long, and luxurious, with the longer hairs measuring 30–40 mm in length (usually much shorter in other Bassaricyon, at least in the predominantly lowland taxa Bassaricyon medius and Bassaricyon alleni, but reaching 25 mm in the highest-elevation populations of Bassaricyon alleni on the eastern versant of the Andes). The hairs of the dorsum, crown, upper limbs, and tail are golden-orange, with grey bases and dark red-brown or blackish-brown tips, generating a distinctly dark, often red-brown appearance, more striking than the relatively drab fur colors (more tan or yellowish-brown to grayish-brown) of other Bassaricyon (Figure 3). The fur of the cheeks, chin, venter, and underside of the limbs is yellow to the bases, often washed with orange. The fur of the face in front of the eyes is shorter and gray or buff with black tipping, sometimes with a pale cream ring around the eyes. The hairs of the tail are strongly tipped with gold, or with both golden and blackish-brown tipping. In contrast to specimens of other Bassaricyon, the tail is not conspicuously banded, though when viewed in the right light, a banding pattern of alternating golden and brown hues is weakly apparent in some specimens. A white terminal tail tip is present in a minority of individuals.

Like other Bassaricyon, the cranium of Bassaricyon neblina is long relative to its width, with a moderately long and broad rostrum, an elongate and somewhat globose braincase with a smooth dorsal surface, and moderately developed postorbital processes.

In Bassaricyon neblina, the temporal ridges do not meet to form a sagittal crest, even in older animals. The postdental palate is usually flared laterally, but is smoothly parallel-sided, tapers posteriorly, or bears only weaker bony flaring in other Bassaricyon (Figures 4–7, 19). At its more extreme development (e.g., in FMNH 70726), the portion of the bony palate sitting behind M2 is almost continuously joined to the postdental palate by a continuous shelf of bone, rather than bearing a deep excavation separating the molar-bearing portion of the bony palate from the postdental shelf (Figure 19). The auditory bullae are very small in the Olinguito relative to other Bassaricyon, both in length and vertical inflation, and the external auditory meatus is considerably narrower in diameter, on average (Figures 4–7). The median septal foramen of the anterior palate (Steno’s Foramen), between the paired incisive (or anterior palatal) foramina, is usually well-developed. The mandible is proportionally less elongate than in other Bassaricyon, with a proportionally larger and more vertically-oriented coronoid process (Figures 4–5). The first two upper premolars are caniniform, similar in size and shape to those of other Bassaricyon. P3 is usually relatively smaller in Bassaricyon neblina than in other Bassaricyon. P4 is similar in structure to congenersbut is relatively larger with a more bulbous protocone and more prominent metacone. M1 and M2 are proportionally lengthened and considerably more massive in appearance, especially relative to skull size, than in other Bassaricyon. p4 is variable in size among Bassaricyon neblina subspecies, generally smaller than other Bassaricyon in Bassaricyon neblina ruber and Bassaricyon neblina hershkovitzi, but proportionally quite large in Bassaricyon neblina neblina. m1 is relatively much larger in Bassaricyon neblina than in other Bassaricyon;each of the four major cusps that define the subrectangular shape of this tooth are massive and bulbous, and the posterior portion is especially broadened, with the metaconid and hypoconid particularly large and laterally expanded relative to congeners. m2 is also often expanded in size in Bassaricyon neblina relative to other Bassaricyon.

 
Lateral flare of the postpalatal shelf in Bassaricyon. Lateral extension of the postpalatal shelf (shown by white arrows) is usually absent or little-developed in other Bassaricyon (e.g., left, Bassaricyon alleni, FMNH 41501), but is well-developed in Bassaricyon neblina (e.g., center, Bassaricyon neblina ruber, FMNH 70721, and right, Bassaricyon neblina hershkovitzi, FMNH 70726).

Natural history: Our field observations document that Bassaricyon neblina is nocturnal, arboreal, frugivorous, and probably largely solitary (compiled during July and August 2006 at Otonga Forest Reserve in Ecuador: 00°41’S, 79°00’W; for faunal and floral context see [149], [150], [151]). It occupies cloud forest canopies and is an adept leaper. It has a single pair of mammae and probably raises one young at a time. Notes associated with AMNH 14185, the first specimen to arrive in a museum, mention that it was “shot at 2 pm [an error for 2 am?] in high trees while coming down mountain to feed on guavas; strictly nocturnal.”

An adult female Olinguito (an animal named “Ringerl”, Bassaricyon neblina osborni, Figure 15) that lived at the Louisville Zoological Park and the National Zoological Park in Washington during 1967–1974 made vocalizations different from those of other Bassaricyon according to [59]. [59] figured a picture of this animal in characteristic estrus behavior and in various other circumstances (see below for more discussion of this captive Olinguito).

Previous identifications and references:

Though described taxonomically for the first time in this paper, the Olinguito (heretofore misidentified as other species of Bassaricyon) has been represented in museum collections for more than a century, has been exhibited in zoos, has had its karyotype published, and has been included in published molecular phylogenetic studies.

Olinguito museum specimens previously reported in the literature include specimens from Gallera, Colombia, mentioned by [152], [153]) (AMNH 32608 and 32609, as “Bassaricyon medius”); a specimen from Santa Elena, Colombia, reported by [154] (AMNH 42351, as “Bassaricyon medius”), specimens from “El Duende Regional Reserve” (2200 m asl; 04°02'55.6"N, 76°27'28.4"W)” and “Los Alpes, Florida, 2250 m asl” in Valle del Cauca Department, Colombia (mammal collection of the Universidad del Valle, Cali, Colombia, specimen numbers 12736, 13700) discussed by [69] (as “Bassaricyon gabbii”); and a skull from San Antonio, Huila Department, Colombia (FMNH 70727) figured by [27] (as “Bassaricyon gabbii”, designated above as the holotype of Bassaricyon neblina hershkovitzi). One Olinguito specimen, AMNH 32609, bears an unpublished scientific name, “Bassaricyon osborni”, written on the skull and on the tags, apparently during the early twentieth century—correctly reflecting an understanding that the specimen represented an undescribed species. This appellation (a “manuscript name”) is likely attributable to J.A. Allen or H.E. Anthony (seemingly too early to be G.H.H. Tate). In any case, the name was never published, and by 1923, Allen had passed away (in 1921) and Anthony had decided that the specimen in question was best referable to Bassaricyon medius (see [154]). We have chosen to validate this name under our own authorship, above, as a subspecies of Bassaricyon neblina.

[155] reported camera-trap photos of a species of Bassaricyon at Munchique in Colombia; these records presumably represent Bassaricyon neblina osborni, the only Bassaricyon recorded at Munchique.

Molecular data for Bassaricyon neblina from a cell line were first generated and used in a phylogenetic study of carnivore relationships by [123], [124]), apparently the same animal whose karyotype was reported and discussed by [147] (also [148]). DNA sequence data (12S rRNA, cytochrome b) from this sample, available on Genbank, have been used in various other published studies (e.g., [156], [157], [158], [159], [160], [161], [162], [87], [163], [164], [122], but not in some important studies, e.g., [71], [165]). This cell line apparently originated from the zoo animal “Ringerl” (discussed by [59]), an adult female Olinguito (Bassaricyon neblina osborni, originally from mountains near Cali, Colombia), apparently exhibited at the Louisville Zoo, National Zoo, Tucson Zoo, Bronx Zoo, and possibly Salt Lake City Zoo during the late 1960s and 1970s (Ingeborg Poglayen-Neuwall, pers. comm. to R. Kays, 2006). Ivo Poglayen-Neuwall (in litt. to C.O. Handley, Jr., 6 November 1964) mentioned another Bassaricyon, a young adult male at the Louisville Zoo, also from Cali, received in 1964, that seems also to have been an Olinguito (“shows the following unusual physical features: (1) strikingly round head… (2) very short, round ears! (3) rather short tail (no amputation!)”). This latter animal seems not to be discussed in Poglayen-Neuwall’s various publications on olingos, and it is unclear what became of it.

Bassaricyon gabbiiEdit

J. A. Allen, 1876:23.

http://species-id.net/wiki/Bassaricyon_gabbii

Northern Olingo# Bassaricyon richardsoni J.A. Allen, 1908:662.# Bassaricyon lasius Harris, 1932:3.# Bassaricyon pauli Enders, 1936:365.

Type specimens and localities.Edit

The holotype of gabbii is USNM A14214, an unsexed adult skull (with dimensions, in this sexually dimorphic species, that indicate that the specimen is female). The holotype skull, collected by William Gabb, was figured by [166]. No specific locality other than Costa Rica was given in the original description ([1]), but [167] later specified its origin as “Talamanca” (i.e., the Talamanca Mountains of southeastern Costa Rica; see also [166]). The skin associated with the specimen was lost before the species was described ([1]). [167] later incorrectly associated the skin of a coati, Nasua narica, with the holotype skull, but corrected this mistake soon after ([168]).

The holotype of richardsoni is AMNH 28486, an adult female (skin and skull), from “Rio Grande (altitude below 1,000 feet), Atlantic Slope”, Nicaragua ([166]). The skull of the type was figured by [166].

The holotype of lasius is UMMZ 64103, an adult male (skin and skull), from “Estrella de Cartago… six to eight miles south of Cartago near the source of the Rio Estrella, … about 4500 feet”, Costa Rica ([169]).

The holotype of pauli is ANSP 17911, an adult male (skin and skull), from “between Rio Chiriqui Viejo and Rio Colorado, on a hill known locally as Cerro Pando, elevation 4800 feet, about ten miles from El Volcan, Province de Chiriqui”, Panama ([170]).

Diagnosis.Edit

This is the largest olingo, measuring larger than all other taxa in most measurements, and is the most sexually dimorphic species of Bassaricyon in cranial characters and measurements (Table 3). It can be distinguished externally from other olingo species by its coloration, which is grayish-brown (less rufous than in other Bassaricyon), with the face usually dominated by gray, the belly fur cream-colored (sometimes washed with orange), and the tail showing a faint banding pattern (Figures 3, 20). Fur length on the dorsum varies noticeably with elevation (longer at higher elevation). The tail is similar in length to the head-body length, averaging shorter relative to total length than in other olingos (Table 5), perhaps an indication of less complete arboreal habits than in other Bassaricyon (an aspect unfortunately not captured well in our Figure 3).

 
Northern Olingo, Bassaricyon gabbii, in life, in the wild. Photographed at Monteverde, Costa Rica by Greg Basco (left) and Samantha Burke (right).

The skull is large compared to other Bassaricyon (Table 3), with the zygomata more widely splayed, particularly in males (Figures 4–5, Table 3), and a wide rostrum. Uniquely in Bassaricyon, a sagittal crest develops in older males. The cheekteeth and auditory bullae are proportionally quite small compared to the size of the skull, relatively smaller than in Bassaricyon medius and Bassaricyon alleni, and the postpalatal shelf tends to be broadened relative to Bassaricyon medius and Bassaricyon alleni. The canines are more massive than in other Bassaricyon. The first lower molar (m1) is distinctively shaped relative to other Bassaricyon, with the paraconid usually situated right at the midpoint of the front of the tooth and often jutting out anteriorly (the m1 paraconid is less prominent and/or situated more antero-medially in other Bassaricyon).

Distribution.Edit

This species occurs in the central portion of Central America, in montane and foothill forests, from northern Nicaragua to Costa Rica and into the Chiriqui Mountains in western Panama, possibly also extending north into Honduras and Guatemala ([29]; see below). Northern olingos are recorded at elevations as low as sea level, but are most commonly encountered in forests above 1000 m, and extend elevationally at least as high as 1700 m (USNM 324293), and probably as high as the upper limit of forest on the highest peaks in Costa Rica. Forested areas above 1000 m in Central America can be understood to be the core distribution of this species. Vouchered records are from the north-central mountains of Nicaragua ([166], AMNH, USNM); the mountains of Costa Rica, including the slopes stretching down to the Atlantic coast ([167], [166], [169], [171], [172], [173], [28], [174], [175], [176], [29]) and a few records of observations from the Pacific slopes (Puntarenas Province: [177]; Guanacaste Province: [178]); and in the Chiriqui Mountains of western Panama ([170], ANSP, USNM). [29] included the Azuero Peninsula of Panama in a distribution map for Bassaricyon, but we can trace no record from this region and the basis of this record is unclear (F. Reid, R. Samudio, J. Pino, in litt., 2012–2013). The eastern limits of occurrence for this species are not yet firmly established, but the boundary of occurrence between Bassaricyon gabbii and Bassaricyon medius orinomus apparently lies between 81 and 80 degrees longitude in central Panama. Ours is the first study to document the marked taxonomic distinction between Bassaricyon gabbii of (especially montane) central Mesoamerica, including western Panama, and Bassaricyon medius orinomus of eastern Panama, the Central American member of a group of closely related lowland taxa that also includes Bassaricyon medius medius (of northern South America west of the Andes) and Bassaricyon alleni (of South America east of the Andes). The nature of the interactions between Bassaricyon gabbii and Bassaricyon medius orinomus at this boundary (whether involving, e.g., parapatry, sympatric overlap, or limited hybridization) is unknown and a priority for field study (see Figures 11–12).

There are unverified records of olingos occurring north of Nicaragua, in Honduras and Guatemala, and these records may represent Bassaricyon gabbii. [125] reported a night sighting of an olingo in Honduras at “La Picucha, Montaña de Babilonia, 1380 m, Parque Nacional Sierra de Agalta, Departamento de Olancho” and discussed a museum specimen of an olingo (later apparently lost) obtained from hunters in Guatemala near the Honduras border at “Montaña Cerro Negro Norte… Río Bobos… 300–500 m” in the Sierra del Merendón, Departamento de Izabal” ([125], [179]). Neither of these localities is immediately adjacent to large contiguous areas of Bassaricyon gabbii occurrence as predicted by our range modeling analyses (Figure 11), but both areas could represent relevant habitats for the Northern Olingo, and verifying the occurrence of olingo populations in Honduras or Guatemala should be considered an important goal in Mesoamerican mammalogy.

Geographic variation.Edit

The nominal taxa richardsoni, lasius, and pauli, synonymized here with Bassaricyon gabbii, were all originally diagnosed based on distinctions in pelage coloration and fur length, in small samples ([166], [169], [170]), and their taxonomic status has never been closely reviewed.

Specimens from northern Nicaragua have fur that is slightly more suffused with orange tones than animals from Costa Rica or western Panama. Nicaraguan populations may deserve recognition as a distinct subspecies, Bassaricyon gabbii richardsoni, as sometimes classified (e.g., [171], [19]), but specimens from Nicaragua are too rare in collections for a detailed assessment, and Nicaraguan animals are otherwise very similar to specimens from Costa Rica and Panama. A young adult female specimen of Bassaricyon gabbii from Almirante in Panama’s Bocas del Toro Province (USNM 316320) is one of few low-elevation records for Bassaricyon gabbii, and is notable in having much smaller teeth than specimens from higher-elevation forests in the adjacent Chiriqui Mountains, and deserves close study in the future. We have carefully examined the type series of the nominal taxa Bassaricyon lasius and Bassaricyon pauli, the morphological attributes of which clearly fall into the range of variation seen in series we refer to Bassaricyon gabbii. We confidently relegate these names, often previously recognized as distinct species known only from the type localities (e.g., [19], [25], [38]), to the synonymy of Bassaricyon gabbii, although we note that the only specimen of gabbii that we have seen from the area of the type locality, the Talamanca Range, is the holotype, which is an adult with worn teeth and no accompanying skin. Without further investigation, ideally involving the compilation and study of greater number of museum specimens from throughout the range of this species, we do not yet advocate recognizing subspecies of Bassaricyon gabbii, though we note that names are available for several of the major sections of the Middle American Highlands (Cordillera de Talamanca: gabbii, Chiriqui: pauli, Cordillera Central: lasius, Nicaraguan Highlands: richardsoni).

Notes.Edit

This is the olingo speciesmost commonly seen and photographed by visitors to the Neotropics, especially because it is present at Monteverde and several other protected areas in Costa Rica that are frequently visited by both tourists and biologists (e.g., [180], [23], [29]). It is larger, more sexually dimorphic, and has a shorter tail than other olingo species, suggesting a different ecology and behavior compared to the slightly better studied Bassaricyon medius and Bassaricyon alleni (see accounts below). Bassaricyon gabbii has been reported feeding on fruit and nectar in rainforest trees, but no details have been published on its diet. Olingos in Monteverde, Costa Rica, are often seen during the day, typically as solitary animals; it is unclear if diurnal activity is typical for the species or if this is in response to being fed by humans at the tourist lodge ([29], [23]). Relevant field notes associated with Bassaricyon gabbii include: “fruit in stomach” (ANSP 18851); “shot in fruit tree at night” (ANSP 18852); “lactating” on 4 June 1937 (ANSP 18894); “shot at 8:00 pm in small trees” (ANSP 17911); mother with accompanying young on 20 August 1909 (AMNH 30748).

Specimens examined.Edit

Costa Rica: AMNH 140334, LACM 26480, 64837, UMMZ 64103 (holotype of lasius), 112321, 112322, USNM A14214 (holotype of gabbii). Nicaragua: AMNH 28486 (holotype of richardsoni), 30748, 30749, USNM 337632, 338859. Panama: AMNH 147772, ANSP 17911 (holotype of pauli), 18850, 18851, 18852, 18893, 18894, BMNH 3.12.6.3, 5.5.4.5, KU 165554, MCZ 38506, TCWC 12941, USNM 316230, 324293, 324294, 516945, 516946.

Bassaricyon alleniEdit

Thomas, 1880:397.

http://species-id.net/wiki/Bassaricyon_alleni

Eastern Lowland Olingo# Bassaricyon beddardi Pocock, 1921a: 231.# Bassaricyon medius siccatus Thomas, 1927:80.

Type specimens and localities.Edit

The holotype of alleni is BMNH 80.5.6.37, an adult female (skin and skull), from “Sarayacu, on the Bobonasa River, Upper Pastasa River …this must not be confused with the far larger and better known Sarayacu on the Ucayali in Peru”, in Amazonian Ecuador ([2]). An image of the holotype as a living animal was figured by [2]: plate XXXVIII), and the anatomy of this specimen was further discussed by [40], [41]).

The holotype of beddardi was an adult female, from “Bastrica Woods, Essequibo River”, Guyana ([181]; [42]), and was an animal that lived in the London Zoological Gardens from 1894 to 1900 (Beddard 1900; [166]). Aspects of the internal anatomy of this specimen were described in detail by Beddard (1900), and the skull of this specimen was figured and discussed by [42], who also mentioned the specimen was prepared as a skeleton ([43]), but apparently this specimen was not retained as a museum specimen in the collections of the BMNH, and now cannot be found (D. Hills, BMNH, in litt., 2004).

The holotype of siccatus is BMNH 27.5.3.2, an adult female (skin and skull), from “Guaicaramo, on the Llanos of Villavicencio, east of Bogata, about 1800 feet”, Colombia ([182]).

Diagnosis.Edit

Bassaricyon alleni is a medium-sized olingo, smaller than Bassaricyon gabbii of Mesoamerica, and larger than Bassaricyon neblina of the Andes. It requires closest comparison with the closely-related and allopatrically-distributed taxon Bassaricyon medius, from which it differs especially in having (externally) more strikingly black-tipped dorsal pelage (giving the pelage a slightly darker appearance in Bassaricyon alleni), (cranially) in its proportionally wider and (on average) shorter rostrum, and in having more inflated auditory bullae (Table 3), and (dentally) in its generally larger p4 (Table 4). Bassaricyon alleni is considerably larger than Bassaricyon medius medius (of South America west of the Andes), such that there is a clear body size contrast between the two lowland olingo taxa of South America (Bassaricyon alleni east of Andes vs. B. medius medius west of Andes), but is very similar in size to Bassaricyon medius orinomus (of eastern Panama). Bassaricyon medius orinomus often has a reddish tail that contrasts somewhat with the less rufous head and body; Bassaricyon alleni tends to be more uniformly colored head to tail. In life, Bassaricyon alleni usually has a darkly pigmented nose, whereas in Bassaricyon medius the nose is often pink (Ivo Poglayen-Neuwall to C.O. Handley Jr., in litt., 9 February 1973; Figures 21–22). Sequence divergence in cytochrome b in these sister species (Bassaricyon alleni, Bassaricyon medius), separated by the Andes, is 6–7% (Table 2).

 
Eastern Lowland Olingo, Bassaricyon alleni, in life, in the wild. Top, photographed at night (accentuating the dark tones in the pelage) at La Esperanza (Distrito de Yambrasbamba, Provincia de Bongará, Departamento Amazonas), 2000 m, northern Peru; Middle, color camera trap photo in forest canopy, from confluence of the Camisea and Urubamba Rivers (11°42'S, 72°48'W). Peru; Bottom, infrared camera trap photo in forest canopy (same locality as middle photo), showing an olingo carrying a baby in its mouth. Top photograph by César M. Aguilar; middle and bottom camera trap photos courtesy of Smithsonian Conservation Biology Institute.
 
Western Lowland Olingo, Bassaricyon medius medius, in life. A wild animal photographed under studio conditions at Las Pampas, adjacent to Otonga Reserve, Ecuador. Photographs courtesy of P. Asimbaya and L. Velásquez.

Distribution.Edit

This is the only species of Bassaricyon found east of the Andes. Bassaricyon alleni has a wide distribution in forests on the eastern slopes of the Andes and in lowland forests east of the Andes, with records from forested areas of Venezuela ([183], [116], [184], [185], [186], [187], BMNH, USNM), Guyana ([42], [188], ROM), eastern Colombia ([182], [189], AMNH, BMNH, USNM), eastern Ecuador ([2], [183], [190], [191], [192], [193], [194], [195], BMNH, EPN, FMNH, MCZ, QCAZ), eastern Peru ([183], [196], [55], [197], [47], [52], [198], [199], [200], [201], [202], [203], [204], [205], [206], [61], [206], [207], [194], [208], BMNH, FMNH, MVZ, UMMZ, USNM, ZMB), northwestern Bolivia ([209], [48], [210], [70], [211], [212], [212], [213]), and western Brazil ([214], [24], Vaz 2004, [215], [67], [216]).

In Guyana, Bassaricyon alleni is recorded only from two specimens, the type of beddardi ([42], see above) and a specimen from Iwokrama Forest ([188], at ROM); there are no records to date from either Suriname or French Guiana, where it might be expected to occur ([217], [218], [219], [188]).

In Brazil, the only firm records are from southwestern Amazonia (the states of Amazonas and Acre) ([214], [24], Vaz 2004, [215], [67], [216]), though it is likely to occur also in Roraima and Pará (Figures 11–12). Brazilian Amazonian records of olingos from the state of Roraima, as “Bassaricyon beddardi” ([220], [220], [221], [222], [223]), are thus far apparently based on misidentifications of kinkajous, Potos ([5]).

The elevational range of Bassaricyon alleni as documented by museum specimens extends from sea level to 2000 m. The great majority of records originate from lowland forests below 1000 m, but specimens from Ecuador and Peru (especially from Chanchamayo) have been collected from 1100 to 2000 m (specimens at BMNH, FMNH, USNM). It seems likely that the distribution of Bassaricyon alleni extends higher on the eastern slopes of the Andes than that of Bassaricyon medius does on the western slopes because of the apparent absence of Bassaricyon neblina on the eastern versant of the Andes.

Karyotype.Edit

The karyotype of a male Bassaricyon alleni (2n = 38, NF = 68; then identified as “Bassaricyon gabbii”) was reported and described by [224], [225]) based on an animal at the National Zoo (Washington, D.C.)—most likely USNM 395837, an adult male received from Leticia, Amazonas District, Colombia (the only male olingo at the zoo at the time).

Geographic variation.Edit

Some geographic variation is apparent in Bassaricyon alleni, and several taxonomic names have been applied to different regional representatives of this species, including in the western Amazon (typical alleni[2]), Guyana (beddardi[42]), and the Eastern Andes of Colombia (siccatus[182]).

The most notable morphological distinction that we have observed within Bassaricyon alleni is between lowland specimens (from forests below 1000 m) and specimens collected in montane forests above 1000 m in the Eastern Andes (e.g., Chanchamayo and Pozuzo in Peru). Specimens from these higher elevations have somewhat shorter tails and are more brownish (less orange tones in pelage), with notably longer fur, and greater development of black tipping to the fur, though the pelage is not as long and luxurious as in Bassaricyon neblina. Press reports of a possibly new species of Bassaricyon discovered in the Tabaconas – Namballe National Sanctuary in the Eastern Andes of Peru (e.g., [226]), where Bassaricyon alleni is predicted to occur (Figure 11–12), may refer to such a highland population of Bassaricyon alleni.

Bassaricyon beddardi of Guyana has often been recognized as a species distinct from Bassaricyon alleni in checklists and inventories (e.g., [188], [32], [5], [37], [38]), but supporting justification has been lacking. The holotype of beddardi, originally a zoo animal, appears to be lost (see above). However, both the holotype (as described by Beddard [1900] and [42]) and a second (and the only additional) specimen from Guyana (ROM 107380, from Iwokrama Forest) closely correspond in their morphological characteristics to Amazonian and Andean specimens of Bassaricyon alleni, and our molecular comparisons demonstrate little molecular divergence between the ROM specimen and a specimen of Bassaricyon alleni from the Peruvian Amazon (Table 1; 1.3% sequence divergence in cytochrome b), such that we suggest that Bassaricyon beddardi can be regarded as a synonym of Bassaricyon alleni. We allocate the name siccatus to the synonymy of Bassaricyon alleni based on geography and craniodental morphology of the type specimen, but further, more detailed study of geographic variation across the range of Bassaricyon alleni would be welcome, perhaps focused in particular on variation across different regions of the Eastern Andes (cf. [183], [182]). At present, we recognize no subspecies within Bassaricyon alleni.

Notes.Edit

Though this is the most widely distributed member of the genus (Figure 12), relatively little is known of this species in the wild. Brief notes about the ecology and behavior of wild Bassaricyon alleni are included in the publications of [47], [14], [48]), [52], and [55]. However, captive olingos described and discussed in detail by [26] (also [57], [60]) were all (or almost all) Bassaricyon alleni, originally from the vicinity of Iquitos (Amazonian Peru), such that for behavior under captive conditions, Bassaricyon alleni is the best studied member of the genus. Most olingos discussed by [59] were probably also Bassaricyon alleni, though one animal, an adult female named “Ringerl” (Figure 15), was an Olinguito, Bassaricyon neblina osborni (see account of Bassaricyon neblina, above). [58] delightful popular article, “The Odorous Olingo,” remains one of the most concentrated sources of firsthand information for this species (and olingos in general), discussing how Bassaricyon alleni is highly arboreal but will cross open spaces on the ground, is active from sunset to dawn, is predominantly frugivorous but also eats some animal matter (small rodents and lizards, nestling birds, insects, and eggs), has little social organization beyond mother-offspring pairs, displays a high intensity of scent marking in both sexes, flees and releases a foul-smelling odor when threatened, has one young following a 72–74 day gestation period, and that males are aggressive with one another and cannot be housed together. Relevant (and limited) field notes associated with Bassaricyon alleni include: “stomach contents fruits and a green vegetable pulp” (USNM 194315); “lactating” on 7 April 1967 (USNM 443717).

Specimens examined.Edit

Colombia: AMNH 70532, 142223, BMNH 27.5.3.2 (type of siccatus), USNM 281482, 281483, 281484, 281485, 395837, 544415. Ecuador: AMNH 67706, BMNH 14.4.25.38, 80.5.6.37 (holotype of alleni), EPN “4”, RM0151, FMNH 41501, 41502, MCZ 37920, 37921, 37922, 37923, QCAZ 3371, YPM 1458, 1459. Guyana: ROM 107380. Peru: AMNH 98653, 98654, 98662, 98709, BMNH 5.11.2.6, 27.1.1.70, 1912.1.15.3, 1922.1.1.17, FMNH 34717, 65787, 65789, 65805, 86908, 86909, 98709, MVZ 153646, 155219, 155220, UMMZ 107907, USNM 194315, 194316, 255121, 255122, ZMB 63197. Venezuela: BMNH 99.9.11.25, USNM 443279, 443717, 443718.

Bassaricyon mediusEdit

Thomas, 1909

http://species-id.net/wiki/Bassaricyon_medius

Western Lowland Olingo# Bassariscyon [sic] gabbi [sic] orinomus Goldman, 1912:16.

Type specimens and localities.Edit

The holotype of medius is BMNH 9.7.17.10, an adult male (skin and skull) from “Jimenez, mountains inland of Chocó, W. Colombia, 2400 feet” ([227]).

The holotype of orinomus is USNM 179157, an adult male (skin and skull), from “Cana (altitude 1,800 feet), in the mountains of eastern Panama” ([228]). [228] figured the holotype skull.

Diagnosis.Edit

Bassaricyon medius is a medium-sized olingo, smaller (on average) than Bassaricyon gabbii of Mesoamerica and larger than Bassaricyon neblina of the Andes. It requires closest comparison with the closely-related, allopatrically-distributed taxon Bassaricyon alleni, from which it differs especially in having (externally) less strikingly black-tipped dorsal pelage (which gives the pelage a slightly darker appearance in Bassaricyon alleni), (cranially) in its proportionally narrower and (on average) longer rostrum, and in having less inflated auditory bullae (Table 3), and (dentally) in its generally smaller p4 (Table 4). Bassaricyon medius medius is considerably smaller than Bassaricyon alleni (of South America east of the Andes), such that there is a clear body-size contrast between the two lowland olingo taxa of South America (Bassaricyon alleni east of Andes vs. B. medius medius west of Andes), but Bassaricyon medius orinomus (of eastern Panama and northwestern Colombia) is very similar in size to Bassaricyon alleni. Bassaricyon medius orinomus often has a reddish tail that contrasts somewhat with the less rufous head and body; Bassaricyon alleni tends to be more uniformly colored head to tail. In life, Bassaricyon alleni usually has a darkly pigmented nose, whereas in Bassaricyon medius the nose is often pink (Ivo Poglayen-Neuwall to C.O. Handley Jr., in litt., 9 February 1973; Figures 21–22). Sequence divergence in cytochrome b in these sister species (Bassaricyon medius, Bassaricyon alleni), separated by the Andes, is 6–7% (Table 2).

Distribution and geographic variation.Edit

Bassaricyon medius occurs in forests from Central Panama to Colombia and Ecuador west of the Andes, where it is recorded from sea level up to about 1800 m elevation. We recognize two distinctive subspecies of Bassaricyon medius, distinguished especially by clear differences in size (Tables 6–7).

Bassaricyon medius medius (Figure 22) occurs in most of the South American portion of the range, where it is recorded west of the Andes in western Colombia ([227]) and western Ecuador ([229], [230], [231], [232]), in the Chocó region, on the western slopes of the Andes, and in outlying western ranges. It occurs in regional sympatry with Bassaricyon neblina at Otonga–San Francisco de las Pampas and probably elsewhere along the western versant of the Andes.

Bassaricyon medius orinomus (Figure 23) occurs primarily in the Central American portion of the range, where it is recorded from central and eastern Panama, from the vicinity of the Canal Zone in the west to the Darien Mountains in the east ([228], [50], [233], [234], [53]). In the Darien, records include Cerro Tacarcuna and Cerro Pirri (USNM series), and as these mountain blocks extend across the Colombian border, there can be no doubt this subspecies enters South America in northwestern Colombia. The two north-westernmost records of Bassaricyon medius in Colombia, from Villa Arteaga, Antioquia District (FMNH 69578) and from the Cauca Valley (AMNH 37797) have large anterior premolars relative to Bassaricyon medius medius and we tentatively attribute them to Bassaricyon medius orinomus, with Bassaricyon medius medius then recorded further south in forests of the Chocó and Western Andean slopes. The specimen from the Cauca Valley (from Puerta Valdivia, Antioquia District: [153]) demonstrates that Bassaricyon medius also occurs in lowland forests in between the Western and Central Andes; another low elevation specimen from the Cauca Valley of Colombia reported by [69] (UV-3774, Río Agua Sucia, Río Cajambre, 725 m) that we have not examined is also presumably Bassaricyon medius.

 
Western Lowland Olingo, Bassaricyon medius orinomus, in life. Wild animals captured, radio-collared, released, and studied by Roland Kays in Limbo Plot, Pipeline Road, Gamboa, Panama ([53]). Photographs courtesy of M. Guerra and R. Kays.

As noted above for Bassaricyon gabbii, the nature of interactions with the distribution of Bassaricyon gabbii on the western margin of the range of Bassaricyon medius in Panama (whether characterized by allopatry, parapatry, or sympatry) is unknown and worthy of study.

Notes.Edit

The first detailed description of representatives of this species was published in French by [235], based on two specimens from Chorrera, near Panama City ([227], [50]), the first specimens to become available after the original discovery of Bassaricyon gabbii in Costa Rica in 1876 ([1]). [227] was first to name it (Bassaricyon medius), based on specimens from western Colombia, and [228], [50]) described the larger Panamanian subspecies (orinomus) and provided brief notes on the species, noting its arboreal, nocturnal, and frugivorous habits, and its association in fruiting trees with Potos. More recent field studies in Panama ([53], [236], Figure 23) are limited but likewise show Bassaricyon medius to be nocturnal, arboreal, frugivorous (and nectarivorous), and to feed in the same trees as kinkajous, which sometimes displace the smaller olingos. It is mostly solitary at night, spends its days in tree holes or other arboreal hide-outs, and usually has one young at a time. One olingo was found to have a home range of 37 hectares. Field workers have described this species’ vocalizations as “whey-chuck”, “wer-toll”, or “wake-up.”

Relevant field notes associated with Bassaricyon medius include: “shot at dusk in high tree in forest” (FMNH 29180); “shot at 8 pm, 40 feet up in large tree, active and agile, but curious, eyes shine brightly” (USNM 305748); “shot at 8:30 pm in avocado plantation” (USNM 305749); “shot near banana plantation (at night), stomach with banana” (USNM 305750); ” “shot at 8:30 pm in large tree in cafetal [coffee plantation], stomach with soft fruit with tomato-like seed” (USNM 305751); “shot at 8 pm in forest” (USNM 307037); “lactating” and pregnant with “1 embryo”, “stomach: fruit pulp” (USNM 310666); “shot in tree at night” (USNM 335767, 338348); “shot at night in tree in forest” (USNM 335769); “shot at night in tree in cocoa grove” (USNM 335770); “shot in small tree in plantain patch at night” (USNM 335771); “one embryo” in a pregnant female “shot in forest” (USNM 363342); “shot in banana tree” (USNM 363343)

Specimens examined.Edit

Bassaricyon medius medius

Colombia: BMNH 9.7.17.10 (holotype of medius), 9.7.17.11, FMNH 29180, 86852, 90049, 90051, MVZ 124112, USNM 598997. Ecuador: AMNH 66752, BMNH 34.9.10.81, 34.9.10.82, EPN 841, 900, MECN DAP37, NMS A59-5081, A59-5082, QCAZ 8758, 8659.

Bassaricyon medius orinomus

Panama: USNM 171138, 179053, 179157 (holotype of orinomus), 179158, 179779, 179917, 206123, 284773, 284903, 284933, 284934, 284935, 305748, 305749, 305750, 305751, 305752, 305753, 305754, 307035, 307036, 307037, 310666, 310667, 310668, 324295, 324296, 335767, 335768, 335769, 335770, 335771, 338348, 338894, 363342, 363343, 363344. Colombia (tentatively attributed): AMNH 37797, FMNH 69578.

DiscussionEdit

Carnivore taxonomyEdit

Descriptions of new species of carnivores are especially rare, and the order Carnivora is generally considered one of the most completely characterized groups across the entire tree of life ([237], [238]). Bassaricyon neblina is a deeply divergent lineage within its genus, a very morphologically distinctive member of the family Procyonidae, and even shows signs of evolutionary diversification across its geographic range. It thus adds significantly to current understanding of taxonomic, phylogenetic, and ecomorphological evolution in the family Procyonidae. It has presumably been overlooked by taxonomists for several reasons—principally the lack of close taxonomic attention paid to Neotropical procyonids for nearly a century ([239], [145]), but probably also because of its nocturnal and arboreal habits, relatively limited geographic distribution, and the small number of specimens scattered across various museum collections (see [240], [241]).

The description of the Olinguito highlights how incompletely known the taxonomy of almost all kinds of mammals remains, including the Carnivora ([242]). Our study of olingo taxonomy is part of a series of studies that have better clarified species diversity in insufficiently studied genera of Carnivora, especially in Neotropical small carnivores (e.g., Procyon: [243], [239], [144]; [244]; Nasuella: [145]; Galictis: [245]), but also in other little-known genera (Arctonyx: [246]; Eupleres: [247]), often revealing considerable overlooked biodiversity in poorly studied groups. Many additional carnivore genera have not been the subject of modern integrative systematic reviews, especially in the Neotropics (e.g., Potos, Nasua, Conepatus). Detailed reviews of these groups are likely to reveal additional overlooked diversity.

ConservationEdit

The rapid and ongoing discovery of endemic mammals and birds in northern Andean cloud forests (e.g., [248], [249], [250], [251], [252], [253]) reaffirms the evolutionary importance of these unique habitats and betrays how incompletely inventoried this biota remains. Though a center of diversity and endemism for many groups (e.g., [254], [255], [256], [257], [258]), northern Andean cloud forests are among the most threatened ecosystems in the Neotropics ([259], [260], [256], [261]). Drawing on the criteria used by the International Union for the Conservation of Nature (IUCN; [261]; in this case, based on inferred population declines due to habitat declines over last three generations), we suggest classifying the Olinguito under the IUCN category of “Near Threatened.” Given that Olinguitos are directly dependent on cloud forest for habitat and food, deforestation appears to be the primary threat to Olinguito populations, and this IUCN categorization reflects our concerns about habitat destruction across its relatively restricted geographic range. Based on our distribution model, it appears that 42% of potential Olinguito habitat in Colombia and Ecuador has already been converted to agriculture or urban environments. Remaining habitat is highly fragmented and faces increasing threats from farming, grazing, deforestation for drug cultivation, logging, and climate change ([137], [260], [262], [263], [264]). The long-term survival of Bassaricyon neblina will depend on the preservation of those upland forest fragments that remain, and restoration of degraded habitat to maintain connectivity between populations. Its discovery introduces a novel flagship species around which to rally conservation initiatives in the region. Preserving cloud forests in this region would benefit the long-term conservation of the Olinguito, and many other Northern Andean cloud forest endemics.

Based on their relatively expansive distributional ranges, all of which include various protected areas (Figures 11, 12), we suggest IUCN Red List rankings of “Least Concern” for Bassaricyon alleni, Bassaricyon medius, and Bassaricyon gabbii, for the present.

BiogeographyEdit

A well-resolved taxonomy for olingos has never been available, such that biogeographic patterns within the genus, and their origins, have never before been critically reviewed ([13]). Our overview of Bassaricyon allows us to glimpse these patterns for the first time, unveiling both anticipated and unexpected biogeographic patterns.

Previous overviews of procyonid biogeography have focused especially on the important potential role of the Great American Biotic Interchange (GABI) in the diversification of the family ([265], [71], [13]). We complement this focus by suggesting that northern Andean uplift, proceeding in greatest part since the middle Miocene ([266], [267], [268]), has played an almost equally important role in procyonid diversification.

The most detailed previous phylogenetic comparisons of olingos ([71]) highlighted the genetic divergence between taxa originating from North America and from South America (Bassaricyon medius from Panama [then called “Bassaricyon gabbii” by [71] and Bassaricyon alleni from Peru), finding that this split apparently postdated the GABI. This comparison was undertaken prior to the discovery of the Olinguito lineage, the deepest split in the genus, and could not resolve the question of whether the radiation of crown group olingos unfolded first in North or in South America. Our phylogenetic comparisons indicate that Bassaricyon neblina, an Andean cloud forest endemic, is the sister taxon to all other Bassaricyon and last shared a common ancestor with congeners3–4 million years ago, a timescale concordant with the timing of both the GABI and Northern Andean mountain-building. That Bassaricyon mainly occurs in South America, with only one species, Bassaricyon gabbii, endemic to Central America, and that the earliest divergence in Bassaricyon is between Bassaricyon neblina and the other three species allows us to suggest that the most important events in the diversification of crown group Bassaricyon occurred in northwestern South America (as suggested by [58]) (see [269] for particularly clear example of this same biogeographic pattern). That the two earliest divergences within the genus involve what are today montane (Bassaricyon neblina of the Andes) or mostly montane (Bassaricyon gabbii of the Costa Rican, Nicaraguan, and western Panama highlands) taxa provides an indication that the isolation of upland Neotropical habitats was likely important in the early diversification of the genus. Uplift of the Andes simultaneously created a barrier to dispersal that is ultimately reflected in the speciation event between the allopatric pair of lowland olingos, Bassaricyon alleni (eastern, cis-Andean) and Bassaricyon medius (western, trans-Andean) (cis- and trans-Andean sensu[270]). In addition to promoting evolutionary diversification within Bassaricyon, Northern Andean uplift has fostered the evolution of other endemic montane procyonids (the Mountain coatis Nasuella olivacea and Nasuella meridensis[145] as well ascurrently unrecognized montane species of Nasua, synonymized uncritically with Nasua nasua under current taxonomic checklists [following [271]). These mountains also served as a key barrier to dispersal of presumed recent North American procyonid immigrants (Procyon lotor and Nasua narica) to South America, which penetrate South America only west of the Andes, primarily in western Colombia ([272]), with Nasua narica perhaps extending also to western Ecuador ([271]) and Procyon lotor perhaps also to western Venezuela ([144]).

The phylogenetic topology seen in Bassaricyon, with an Andean species sister to a clade of lowland congeners, is unusual among mammals, but seen in some groups with lowland representatives restricted to the Amazon. For example, the echimyid rodent genera Dactylomys and Isothrix present this pattern, with Isothrix barbarabrownae and Dactylomys peruanus restricted to the Andes and their congeners to the Amazon lowlands ([273], [274], [258]). In olingos, the time estimates for this diversification are broadly equivalent with the estimated Pliocene divergence timing (2–5 mya) proposed between Isothrix barbarabrownae and its lowland congeners ([275]). A similar pattern of inferred colonization from the Andes to the Amazonian lowlands was proposed for dendrobatid frogs, but occurred earlier, during the late Miocene (11.2 – 5.3 mya), when the Andes were considerably lower in elevation ([276]).

One species of olingo, Bassaricyon alleni,is endemic to habitats east of the Andes, especially the Amazon. The Amazon is arguably the most diverse region of the planet (e.g. [277], [278]; but see [279]), and it has been postulated that its high current diversity is a result of an accumulation of lineages for a prolonged period of time, covering mostly the Pliocene and Miocene, with subsequent local divergences (e.g., [280]; [281]). However, Bassaricyon alleni appears to be a considerably more recent immigrant to this region, likely arriving in the Pleistocene, during the past 1–2 mya (Figures 1–2), well after the last major uplift of the Andes, which occurred until circa 3.0 mya ([266]). Thus, it is likely that a dispersal event across the North Andes is responsible for the cis-Andean distribution of Bassaricyon alleni. This supports the idea that the Andes and the trans-Andean Neotropics (the western side of South America, and Central America) serve as continuous pumps of diversity into the Amazon, as proposed in other vertebrate groups such as tanagers and woodcreepers (e.g. [282], [283]). The western boundary of the Amazon with the Andes and close proximity to the Chocó and Central America contribute to an influx of species from these regions into the Amazon and this influx seems to be a principal driver of the high diversity of the western Amazon and the eastern slopes of the Andes ([258]).

One species of olingo, Bassaricyon medius, is distributed in the Chocó forests to the west of the Western Andes of Colombia and Ecuador, as well as in tropical forests of eastern Panama in Central America (Figure 12). For vertebrates, this is a common pattern: the Chocó has closer biogeographic affinities with Central America than with other areas of South America ([284]). Mammalian examples of a Chocó + Central America distributional pattern include many medium-sized species in the region, including Nasua narica, Procyon lotor, Coendou rothschildi, Tamandua mexicana, Caluromys derbianus, and Philander opossum ([11], [285], [286], [287], [272]). That these various distributions result from multiple biogeographic events is evidenced by the dissimilar evolutionary divergence timings involved, but the GABI and Northern Andean uplift no doubt are key events that collaborated to generate these co-distributions. The divergence between the two subspecies of Bassaricyon medius is recent (circa 1.0 mya, Figure 1), but considering both subspecies are recorded in Colombia, it seems possible that Bassaricyon medius entered Panama quite recently, perhaps penetrating the North American continent as far as the distribution of the Mesoamerican endemic taxon Bassaricyon gabbii. The location of the geographic boundary between Bassaricyon medius and Bassaricyon gabbii in Panama is not yet clear, and the nature of interaction between these species, if any, at this boundary, will be a very interesting subject for further investigation.

The last species of olingo to consider, Bassaricyon gabbii, is a Mesoamerican endemic, distributed from Nicaragua to western Panama and recorded primarily in montane contexts: the Nicaraguan highlands, Costa Rican cordilleras, and Chiriqui Mountains. The eludication of the phylogenetic relationship, depth of divergence (we estimate a circa 2.0 mya divergence between Bassaricyon gabbii and the lowland species-pair Bassaricyon medius/Bassaricyon alleni) and the distinctive morphological features of Bassaricyon gabbii allow us to recognize it as the only carnivore species endemic to this region of Central America, although many vertebrate species, especially birds, reptiles and amphibians, and small mammals, are endemic to this same region ([288], [289], [290], [291], [292]). As noted by [292], “some have attributed the high endemism to the possible isolation of the Talamanca-Chiriquí region as an island, or a series of islands, within the Panamanian portal prior to complete closure and late-Pliocene formation of the landbridge” (citing [293], [294], among others). This vision of insular or archipelagic diversification in Bassaricyon during the GABI may provide insight into the early splits in the genus that ultimately gave rise to the principal modern lineages so far identified in the genus: Bassaricyon neblina in the Andes of northwestern South America, Bassaricyon gabbii in the Nicaragua-W Panama highlands, and Bassaricyon medius/Bassaricyon alleni in the Neotropical lowlands primarily in South America (southward from eastern Panama). Additional geographic surveys, specimen collecting, and specimen-based comparisons are needed to better understand the nature of differentiation in Bassaricyon gabbii across different Central American cordilleras, and the true easternmost extent of its distribution, where it may co-occur with or abut the range of Bassaricyon medius.

Additional Olinguito study prioritiesEdit

Our studies of Olinguito specimens in museums reveal a remarkable pattern of geographic variation, allowing for the delineation of four distinctive subspecific taxa distributed in separate biogeographic regions of the Andes of Colombia and Ecuador. Additional study is needed to more fully evaluate the level of genetic divergence between different Olinguito subspecies, especially for Bassaricyon neblina ruber, perhaps the most isolated and distinctive of the four (Figures 3, 9–10, 13–16).

Our bioclimatic analyses (Figures 11–12) also identify a number of high-priority candidate regions where further exploration is needed to assess whether additional populations of the Olinguito, or other distinctive high-elevation Bassaricyon populations, are present (Figure 24). One of these is the Colombian Eastern Andes, or Cordillera Oriental, the eastern branch of the Andes in Colombia. Olinguitos are recorded from the Western and Central Andes of Colombia, but not yet from the Eastern Andes, an area of substantial montane biotic endemism, where only Bassaricyon alleni is known to occur. Another survey priority is the Quijos region of Ecuador, a county and river situated on the eastern side of the Andes, which comprises relevant cloud forest habitats (Quijos is an old, pre-Spaniard name for the indigenous community in the area). This region deserves greater attention and contains the important Papallacta region discussed by [295]. The Pallatanga-Sangay region in the Central Andes of Ecuador is another important priority study area; Pallatanga is an important mammal type locality ([296]), and Sangay is a national park with peculiar cloud forest mammal representation ([297], [298]). Finally the Loja-Huancabamba, a low elevation region of the Andes in southern Ecuador and northern Peru has potential as Olinguito habitat. Though situated on the eastern side of the Andes, this region was recognized as biogeographically important by [299]. [300] showed little differentiation between Artibeus from the western slope of the Andes and the Marañón valley in this area of northern Peru, and [301] inferred potential cases of east-west dispersal in vampire bats across both slopes of the Andes in this region of southern Ecuador, suggesting this could well be an area where the Olinguito could cross from the western to the eastern versant of the Andes.

 
Selected priority areas to search for Olinguitos. Areas mentioned in the text with appropriate cloud forest habitats. A) Cordillera Oriental, the eastern branch of the Andes in Colombia. B) Quijos, a county on the eastern side of the Andes in Ecuador. C) Pallatanga-Sangay in central Ecuador. D) The Loja-Huancabamba region of the Andes in southern Ecuador and northern Peru.

Much remains to be learned about the Olinguito, including its distribution. The taxonomic description of this species is the first step toward further studies of its biology, and we look forward to future reports of additional discoveries from Andean cloud forests regarding this beautiful procyonid.

Supplementary MaterialEdit

XML Treatment for BassaricyonneblinaEdit

File:Zookeys.324.5827-treatment1.xml

XML Treatment for BassaricyonneblinaneblinaEdit

File:Zookeys.324.5827-treatment2.xml

XML Treatment for BassaricyonneblinaosborniEdit

File:Zookeys.324.5827-treatment3.xml

XML Treatment for BassaricyonneblinahershkovitziEdit

File:Zookeys.324.5827-treatment4.xml

XML Treatment for BassaricyonneblinaruberEdit

File:Zookeys.324.5827-treatment5.xml

XML Treatment for BassaricyongabbiiEdit

File:Zookeys.324.5827-treatment6.xml

XML Treatment for BassaricyonalleniEdit

File:Zookeys.324.5827-treatment7.xml

XML Treatment for BassaricyonmediusEdit

File:Zookeys.324.5827-treatment8.xml

AcknowledgmentsEdit

For assistance in Ecuador we thank E. Tapia, C. Tapia, G. Onore, P. Asimbaya, L. Velásquez, P. Rosero, M. Grijalva, G. Acosta, P. Pinto, M. Gallo, A. Padilla, M. Vargas, P. Vargas, I. Rodriguez, C. Byrne, and Fundación Otonga. For access to specimens under their care, loan of tissues, and other assistance during museum visits we are grateful to D. Lunde, E. Westwig, R. Voss, W. Stanley, B. Patterson, L. Heaney, R. Banasiak, S. Burneo, R. Timm, J. Patton, C. Conroy, M. Engstrom, B. Lim, J. Eger, P. Jenkins, R. Portela Miguez, D. Hills, J. Chupasko, N. Gilmore, J. Dines, J. Light, W. Murphy, R. Asher, I. Thomas, L. Albuja-V., O. Groenwall, R. Anderson, E. Sargis, K. Zyskowski, P. Myers, S. Jansa, R. Baker, K. Koepfli, R. Fleischer, R. Arcos, C. Handley, Jr., L. Gordon, and H. Kafka. For assistance in the registrar’s office at the National Zoo, we thank L. Morse. For helpful reviews, helpful discussion, and other assistance, we thank W. Bogdanowicz, B. Patterson, R. Sampaio, E. Gutiérrez, G. Slater, K. Koepfli, R. Anderson, I. Poglayen-Neuwall, J. Gibbons, P. Engelbrektsson, F. Reid, J. Pino, R. Samudio, M. Bass, T. Flannery, E. Eizirik, R. Baker, H. Mantilla, R. Ree, R. Voss, and L. Emmons. This work was partially funded by the Smithsonian Institution. M.P. was supported in part by a grant from the Texas Tech University Association of Biologists. We thank Nancy Halliday for original artwork. For photographic contributions we thank P. Asimbaya and L. Velásquez of Finding Species, and M. Gurney, I. Poglayen-Neuwall, T. Gregory (Smithsonian Conservation Biology Institute), C. Aguilar, G. Basco, M. Guerra, R. Banasiak, R. Bornholdt, and S. Burke.

Appendix 1Edit

MorphometryEdit

Table A1.Edit

"PCA for male Bassaricyon skulls: variable contributions for the PCA axes that are graphically represented in Figure 6."
VariablePC1PC2
p2W0.877-0.077
p3W0.7680.004
p4W0.600-0.267
P4L0.306-0.412
P4W0.526-0.245
M1L0.136-0.427
M1W0.336-0.475
m1L0.079-0.241
m1W-0.069-0.750
m2L-0.3440.196
m2W0.164-0.330
CBL0.7330.317
ZYG0.8060.011
BBC0.549-0.050
HBC0.458-0.022
MTR0.5440.411
CC0.912-0.013
WPP0.226-0.464
LPP0.704-0.464
LAB0.3660.736
EAM0.3680.825
Eigenvalue0.0350.030
Variance (%)30.125.8

Table A2.Edit

"PCA for female Bassaricyon skulls: variable contributions for the PCA axes that are graphically represented in Figure 7."
VariablePC1PC2
p1W-0.3890.424
p2W-0.7650.341
p3W-0.6630.560
p4W-0.7830.068
P2W-0.7450.342
P3W-0.7240.221
P4L-0.649-0.314
P4W-0.631-0.370
M1L-0.565-0.275
M2L-0.550-0.003
M2W-0.606-0.324
m1L-0.637-0.200
m1W-0.644-0.524
m2L-0.452-0.166
m2W-0.665-0.302
CBL-0.3480.579
ZYG-0.2310.402
BBC-0.3170.210
MTR-0.5570.389
CC-0.5110.249
WPP-0.342-0.474
LPP-0.170-0.216
LAB-0.0180.733
EAM0.0660.743
Eigenvalue0.0340.021
Variance (%)29.118.2

Table A3.Edit

"DFA for male skulls of Bassaricyon gabbii, Bassaricyon medius, and Bassaricyon alleni, including correlation coefficients for the axes that are graphically represented in Figure 8. (Wilks’ Lambda: 0.11054 approx. F (16,58) = 7.2781 p < 0.0000)."
CV 1CV 2Wilks’ LambdaPartial LambdaF-remove (2,29)p-valueToler.1-Toler. (R-sq)
p1W0.249-0.5980.1250.8851.8870.1700.5260.474
P3W-0.644-0.3490.1560.7085.9710.0070.7570.243
M2L0.2150.3170.1150.9580.6350.5370.5000.500
m1W0.0890.0620.1110.9960.0630.9390.5400.460
HBC-0.8550.2070.1810.6109.2670.0010.6530.347
ZYG-0.2740.1740.1190.9331.0480.3630.9160.084
WPP0.289-0.8900.1810.6129.1910.0010.8780.122
LPP0.5510.2130.1340.8283.0160.0650.6600.340
Eigenvalue3.7500.904
Variance (%)80.519.5

Table A4.Edit

"PCA for Bassaricyon neblina skulls: variable contributions for the PCA axes that are graphically represented in Figure 9."
VariablePC1PC2
CBL-0.6820.632
ZYG-0.804-0.185
BBC-0.671-0.373
HBC-0.214-0.689
MTR-0.6440.664
CC-0.8790.186
WPP-0.194-0.622
LPP-0.8540.461
LAB-0.3320.562
EAM0.5310.762
Eigenvalue0.0160.013
Variance (%)39.733.0

Appendix 2Edit

"List of localities discussed in text and used in niche modeling analyses (visual records excluded from modeling)."
taxonlatitude, longitudelocality
Bassaricyon gabbii10.367, -83.850Costa Rica: 9 mi NNW Roxana on Rio Chirripo
9.800, -83.900Costa Rica: Estrella de Cartago, 6 or 8 miles south of Cartago near the source of the Rio Estrella, altitude of ca. 4,500 feet.
9.717, -84.267Costa Rica: Fila Geronimo
10.250, -84.433Costa Rica: Lajas Villa Quesada
8.783, -82.950Costa Rica: Las Cruces Reserve (visual record only)
10.100, -83.433Costa Rica: Monteverde, Puntarenas Prov., T Guindez pasture
10.467, -84.000Costa Rica: Puerto Viejo, Rio Sarapiqui
10.467, -84.017Costa Rica: Rio Sarapiqui,Puerto Viejo, 300FT
9.950, -84.050Costa Rica: San Gerardo
9.600, -82.783Costa Rica: Talamanca (see [166])
15.367, -88.733Guatemala: La Sierra del Merendón (visual record only)
14.983, -85.933Honduras: Sierra de Agalta (visual record only)
13.150, -86.150Nicaragua: Jinotega, 16 km E, 5.5 km N Hacienda la Trampa
12.917, -85.917Nicaragua: Matagalba
12.733, -85.733Nicaragua: Rio Grande, south of Tuma, altitude below 1000 ft, Atlantic slope
13.017, -86.000Nicaragua: Tepeyac Matagalpa
8.783, -82.417Panama: Chiriqui, Boquete
8.850, -82.567Panama: Chiriqui, Cerro Punta, Casa Tilley
8.850, -82.767Panama: Chiriqui, Osta Clara
8.883, -82.567Panama: Chirirqui, between Rio Chiriqui Viejo and Rio Colorado, on a hill known locally as Cerro Pando, elevation 4800 feet, ca. 10 miles from El Volcan.
9.300, -82.400Panama: Almirante, Bocas del Toro
Bassaricyon medius orinomus7.300, -75.383Colombia: Puerta Valdivia
7.833, -76.500Colombia: Antioquia, Usaba, Villa Arteage, 130 m
9.150, -79.850Panama: Barro Colorado Island
8.867, -79.717Panama: Caimito
8.950, -77.817Panama: Campo Sasardi, 4 miles, W Mulatupo, Camarca de San Blas
7.817, -77.717Panama: Cana, in the mountains of the east
9.283, -79.967Panama: Canal Zone Rio Indio near Yatun
9.167, -79.417Panama: Cerro Azul, La Zumbadora
9.200, -80.133Panama: Colón Salud
7.517, -78.167Panama: Darien Jaque, near junction Rio Jaque and Rio Imamado
7.950, -77.500Panama: Darien Rio Paya (mouth)
8.083, -77.283Panama: Darien Tacarcuna, casita camp
9.450, -79.067Panama: Mandinga
9.167, -79.667Panama: Mouth of Rio Hondo, near Juan Mina
7.817, -77.717Panama: Mt Pirri, near head of Rio Limon
9.217, -79.683Panama: near Palenque
9.150, -79.733Panama: Parque National Soberania, lowland forest.
9.450, -78.967Panama: Rio Carti
8.667, -77.467Panama: San Blas Armila, Quebrada Venado
Bassaricyon medius medius3.350, -77.000Colombia: Agua Sucia, Rio Cajambre
4.950, -77.367Colombia: Chocó, Rio Baudo, Rio Saudo
3.667, -76.400Colombia: Dagua
3.783, -76.767Colombia: Jimenez, mountains inland of Chocó
2.883, -77.667Colombia: Rio Saija, La Boca
3.800, -76.633Colombia: Valle del Cauca, Sabaleta
-0.433, -78.967Ecuador: Cotopaxi, Las Pampas
-2.167, -79.900Ecuador: Guayas, Guayaquil
-2.567, -79.350Ecuador: Manta Real
0.117, -78.833Ecuador: Pichincha, near Gualea, W side Pichincha
-0.050, -78.767Ecuador: Pichincha, near Mindo
-0.250, -79.150Ecuador: Santo Domingo de los Tsachilas
Bassaricyon alleni-13.633, -68.750Bolivia: Alto Madidi
-17.000, -64.000Bolivia: Buena Vista
-16.800, -64.950Bolivia: Campamento Yuqui
-11.567, -67.133Bolivia: Cotoca Camp
-17.100, -64.783Bolivia: Sajta
-11.400, -69.017Bolivia: San Sebastien
-17.450, -63.850Bolivia: Santa Cruz, Ichilo, Rio Isamo, 400 m
-4.150, -60.117Brazil: Amazonas, Campina do Tupana (visual record only)
-8.667, -72.783Brazil: Acre
-7.432, -73.661Brazil: Acre, Serra do Divisor N.P.
-5.083, -61.467Brazil: Amazonas, Capina do Igapo Acu, 256km s of Manaus
-5.200, -69.316Brazil: Amazonas, Cujubim S.D.R., Curuena
-7.467, -71.100Brazil: Amazonas, Gregorio River E.R.
-8.417, -72.400Brazil: Amazonas, Igarape´ Porangaba
-3.883, -60.617Brazil: Amazonas, Modulo PPBio Manaquiri (visual record only)
-5.450, -69.267Brazil: Amazonas, Uacari S.D.R. (visual record only)
4.667, -73.067Colombia: Guaicaramo, on the Llanos of Villavicencio, east of Bogota
3.100, -73.917Colombia: Macarena Mountains
10.583, -72.867Colombia: Magdalena, Valledupar, Villanueva, Rio Cesar
4.150, -73.450Colombia: Medina
10.583, -72.867Colombia: Sierra Negra, Magdalena, Valledupar, Villanueva
-3.517, -78.450Ecaudor: Gualaquiza
-3.483, -78.233Ecuador/Peru: Coangos
-0.633, -77.417Ecuador: Avila
-1.733, -77.483Ecuador: Jatun Yacu, Rio Rutuno
-0.450, -77.883Ecuador: Napo, Baeza
-2.067, -76.967Ecuador: Pastaza, Rio Bobonaza, Montalvo
-2.117, -77.450Ecuador: Road Sarayacu, Copataz
5.783, -57.633Guyana: Bastrica (= Bartica) on the Essequibo River in British Guiana
4.733, -58.850Guyana: Burro-Burro River, Iwokrama Forest
-10.667, -73.900Peru Uvini, Rio Cosireni
-8.833, -74.683Peru: Aguas Calientes, etc.
-10.133, -71.217Peru: Balta
-11.867, -72.783Peru: Cashiriari
-11.900, -71.367Peru: Cocha Cashu
-12.833, -69.300Peru: Explorer’s Inn Reserve
-11.050, -75.317Peru: Junin, Chanchamayo, 1200 m
-3.767, -73.250Peru: Loreto, Iquitos, Santa Rita 120 m
-5.517, -74.367Peru: Loreto: Rio Ucayali, Yarinacocha
-10.383, -75.450Peru: Pasco, Cerros de Yanachagua
-7.633, -75.017Peru: Pisqui R, Ucalayi
-10.067, -75.533Peru: Pozuzo
-11.783, -72.700Peru: San Martin
-13.150, -69.600Peru: Tambopata
-4.450, -78.150Peru: Tseasim (Aguaruna village), Rio Huampami of Rio Cenepa
4.900, -67.800Venezuela: Munduapo, R. Orinoco, Venezuela
2.250, -65.283Venezuela: T. F. Amazonas, 108 km SE, Rio Mavaca,
5.400, -67.650Venezuela: T. F. Amazonas, 32 km SSE Puerto Ayacucho, Raya
8.167, -72.167Venezuela: Tachira 45 km N & 6 km E San Cristobal
Bassaricyon neblina3.253, -76.160Colombia, Los Alpes, Florida
6.333, -76.117Colombia: Antioquia, Urrao, Rio Ana
6.333, -76.167Colombia: Antioquia, Urrao, Rio Urrao
5.545, -75.496Colombia: Castillo Mts
2.583, -76.917Colombia: Cauca, Gallera
2.533, -76.950Colombia: Cauca, Munchique, 2000 m
2.533, -76.883Colombia: Cauca, Sabanetas
4.049, -76.458Colombia: El Duende Regional Reserve
2.417, -76.817Colombia: El Tambo
1.950, -76.483Colombia: Huila, San Agustin, San Antonio
6.217, -75.533Colombia: Santa Elena
-0.617, -78.983Ecuador: Cotopaxi, La Cantera in the trail to Sigchos
-0.583, -78.983Ecuador: Cotopaxi, near La Cantera in the trail to Sigchos
-0.417, -79.000Ecuador: Cotopaxi, Otonga
-0.533, -78.650Ecuador: S Domingo Trail, Las Maquinas
-0.021, -78.684Ecuador: Tandayapa

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  113. ↑ Stephens and Taylor (1983 Cite error: Invalid <ref> tag; name "B259" defined multiple times with different content
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