Animals that possess, at some stage of development, a notochord, a dorsal nerve cord and pharyngeal slits; in vertebrates the notochord is replaced by a backbone. Chordata includes every fish, amphibian, reptile, bird and mammal, along with the less familiar sea squirts and lancelets that retain the phylum's ancestral body plan.
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Disputed
Member Species/Taxa CountApproximate described-species (or, for a genus, described-taxon) count; continually revised as species are newly described, reclassified or synonymized. Taxonomic Rank Scientific Name Chordata
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