Urochordatan.
/ˌjʊərə(ʊ)kɔːˈdeɪtə/, /ˌjɔːrə(ʊ)kɔːˈdeɪtə/, U.S. /ˌjʊrəˌkɔrˈdɑdə/, /ˌjʊrəˌkɔrˈdeɪdə/ Zoology.
With plural agreement: a group of marine invertebrates that comprises the sea squirts and other tunicates, the adults of which typically have a rubbery external tunic and a pharynx that is perforated for filter-feeding, and (in some forms) ‘tadpole’ larvae that possess a notochord. Also: animals of this group (collectively or individually); tunicates.The Urochordata (formerly Urochorda) or Tunicata were originally thought to be molluscs, but they are now regarded as the most primitive subphylum (or phylum) of chordates.
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the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > division Molluscoidea > [noun] > division Tunicata
Tunicata1828
Urochordata1885
1885 F. J. Bell Compar. Anat. & Physiol. ix. 313 In the Urochordata the notochord is only found in the tail; it either is persistent, or is aborted.., or it is never developed at all.
1940 G. S. Carter Gen. Zool. Invertebr. xiv. 267 A mucus net covering gill-slits..seems to have been the primitive chordate feeding method and occurs to-day in the Urochordata (Tunicata), Amphioxus, and..in the ammocœte larva of the lamprey.
1971 Biol. Bull. 141 130 Members of the genus Ecteinascidia belong to the Subphylum Tunicata. This subphylum is also referred to as the Urochordata (Urochorda), and the animals are commonly known as ascidians or sea-squirts.
2002 H. J. Morowitz Emergence of Everything xvii. 112 Emergent in Urochordata evolution are internal organs such as heart, liver, and stomach.
This entry has been updated (OED Third Edition, September 2009; most recently modified version published online December 2021).
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n.1885