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

   types:

   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
   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