urochord

The caudal chord of an ascidian or tunicate, likened to the notochord, chorda dorsalis, or dorsal chord of a vertebrate; the central axis of the appendage of certain adult tunicates, as an appendicularian, and the corresponding structure of embryonic or larval tunicates in general.

Any member of the Urochorda.

The central axis or cord in the tail of larval ascidians and of certain adult tunicates.

a notochord that is limited to the caudal region; especially in the Urochordata

any marine organism of the Urochordata

a notochord of a larval tunicate typically confined to the caudal region

primitive marine animal having a saclike unsegmented body and a urochord that is conspicuous in the larva