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Vertebrata

A Dictionary of Zoology | 1999 | | © A Dictionary of Zoology 1999, originally published by Oxford University Press 1999. (Hide copyright information) Copyright

Vertebrata (kingdom Metazoa, phylum Chordata) The subphylum which includes the fish, Amphibia, Reptilia, Aves, and Mammalia. These appear successively in the fossil record, starting in the Ordovician (although traces of fish are now known from the late Cambrian). The lower chordates (e.g. the living Amphioxus) are soft-bodied and first appear in the Cambrian.

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