File:EB1911 Sponges - Tetraxon type of Spicule and its derivatives.jpg

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Summary

Description

English: The Tetraxon type of Spicule and its derivatives, found in Tetraxonida:

1, Primitive tetract.

2, Plagiotriaene.

3, Dichotriaene.

4, Discotriaene.

5, Anatriaene.

6, Protriaene.

7, 8, Reduced triaenes, becoming monaxon.

9, Tetracrepid desma.

10, Primitive diact.

11, Oxeate.

12, Style.

13, Tylostyle.

14, Acanthotylostyle.

14a, 14b, Pseudasters.

15, Cladotylote.

16, Acanthoxeate.

16a, Pseudaster (amphidisc).

17, Strongyle.

18, Tylote.

19, Cladostrongyle.

20, Rhabdocrepid (monocrepid) desma.

21, Aster.

22, Spheraster.

23, Sterraster.

24, Spiraster.

25, Chiaster.

26, Oxyaster.

27, Aster with branching rays.

28, Rhaphis or trichite.

29, Trichodragma.

30, Sigmata.

31, Isochela.

32, Anisochela.

33, Diancistron.

34, Toxon.

35, Labis (forcipiform).

Date

published 1911

Source

“Sponges,” Encyclopædia Britannica (11th ed.), v. 25, 1911, p. 723, fig. 29.

Author

Arthur Dendy

Permission
(Reusing this file)

This image comes from the 13^th edition of the Encyclopædia Britannica or earlier. The copyrights for that book have expired in the United States because the book was first published in the US with the publication occurring before January 1, 1929. As such, this image is in the public domain in the United States.

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	16:37, 4 October 2018		791 × 1,112 (238 KB)	Bob Burkhardt	{{Information \|description ={{en\|1=The Tetraxon type of Spicule and its derivatives, found in Tetraxonida: 1, Primitive tetract. 2, Plagiotriaene. 3, Dichotriaene. 4, Discotriaene. 5, Anatriaene. 6, Protriaene. 7, 8, Reduced triaenes, becoming monaxon. 9, Tetracrepid desma. 10, Primitive diact. 11, Oxeate. 12, Style. 13, Tylostyle. 14, Acanthotylostyle. 14a, 14b, Pseudasters. 15, Cladotylote. 16, Acanthoxeate. 16a, Pseudaster (amphidisc). 17, Strongyle. 18, Tylote...

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