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urochord

Definitions of urochord
  1. noun
    primitive marine animal having a saclike unsegmented body and a urochord that is conspicuous in the larva
    synonyms: tunicate, urochordate
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    types:
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    ascidian
    minute sedentary marine invertebrate having a saclike body with siphons through which water enters and leaves
    salp, salpa
    minute floating marine tunicate having a transparent body with an opening at each end
    doliolum
    free-swimming oceanic tunicate with a barrel-shaped transparent body
    larvacean
    any member of the class Larvacea
    appendicularia
    free-swimming tadpole-shaped pelagic tunicate resembling larvae of other tunicates
    sea squirt
    ascidian that can contract its body and eject streams of water
    type of:
    chordate
    any animal of the phylum Chordata having a notochord or spinal column
  2. noun
    a notochord of a larval tunicate typically confined to the caudal region
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    type of:
    notochord
    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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