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Chordata
Overview of the taxonomy of Phylum Chordata, which includes the well-known vertebrates (fishes, amphibians, reptiles, birds, mammals), hagfishes, tunicates, and lancelets.
Vertebrata
Introduction to the vertebrates and their classification, including the Hyperoartia, or lampreys, and the Gnathostomata, or jawed vertebrates.
Gnathostomata
Philippe Janvier's article about the jawed vertebrates in the Tree of Life website.
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