DescriptionPSM V84 D536 Facts and factors of development fig12.jpg
Fig. 12. Cross section of Amphioxus larve in successive stages of development. A, through a larva similar to 11A; B and C, of a larva similar to 11B; D, of a still oder larva; ect, ectoderm; ent, entoderm; mes, mesoderm; ch, notochord; np, neural plate; gc, gastrocoel; ac, alimentary canal; coel, coelom.
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