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Chordata British & World English

A large phylum of animals that includes the vertebrates together with the sea squirts and lancelets. They are distinguished by the possession of a notochord at some stage during their development

Chordata in Cephalochordata British & World English

A small group of marine invertebrates that comprises the lancelets

Chordata in chordate British & World English

An animal of the large phylum Chordata, comprising the vertebrates together with the sea squirts and lancelets

Chordata in conodont British & World English

A fossil marine animal of the Cambrian to Triassic periods, having a long worm-like body, numerous small teeth, and a pair of eyes. It is now believed to be the earliest vertebrate

Chordata in lancelet British & World English

A small elongated marine invertebrate that resembles a fish but lacks jaws and obvious sense organs. Lancelets possess a notochord and are among the most primitive chordates

Chordata in Urochordata British & World English

A group of chordate animals that comprises the tunicates

Chordata in vertebrate British & World English

An animal of a large group distinguished by the possession of a backbone or spinal column, including mammals, birds, reptiles, amphibians, and fishes