Structure of ascidian tadpole larva |Sea-squirt |General character of ascidian tadpole | Urochordata

Structure of tadpole larva:
The tadpole larva is very active at the beginning which, in course of metamorphosis, transforms into a sessile adult.

i. A fully grown tadpole larva is highly motile and does not take food from outside, i.e., it is a non-feeding form.
ii. It has an elongated body.
iii. The body is more or less oval in out¬line.
iv. It is distinctly divisible into two regions—the head and the tail
v. The whole of the body is covered over by the tunic.
vi. The head is elliptical and has three adhesive papillae or chin warts.
vii. The tail is laterally compressed and pointed terminally.
The central nervous system is situated dorsal to the notochord. It enlarges anteriorly into a sensory vesicle which opens into the pharynx near the mouth by neuropore.

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