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primitive marine animal having a saclike unsegmented body and a urochord that is conspicuous in the larva
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minute sedentary marine invertebrate having a saclike body with siphons through which water enters and leaves
minute floating marine tunicate having a transparent body with an opening at each end
free-swimming oceanic tunicate with a barrel-shaped transparent body
any member of the class Larvacea
free-swimming tadpole-shaped pelagic tunicate resembling larvae of other tunicates
ascidian that can contract its body and eject streams of water
any animal of the phylum Chordata having a notochord or spinal column
a notochord of a larval tunicate typically confined to the caudal region
a flexible rodlike structure that forms the supporting axis of the body in the lowest chordates and lowest vertebrates and in embryos of higher vertebrates
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