Chordata - Overview of the taxonomy of Phylum Chordata, which includes the well-known vertebrates (fishes, amphibians, reptiles, birds, mammals), hagfishes, tunicates, and lancelets.
Gnathostomata - Philippe Janvier's article about the jawed vertebrates in the Tree of Life website.
Phylum Chordata - Brief introduction to the chordates, defined as organisms that possess a structure called a notochord, at least during some part of their development. Includes links to information about subgroups and representative animals.
Phylum Hemichordata, Urochordata and Cephalochordata - Illustrated description of these three phyla, and the three classes within Urochordata. Also information on the larval stages, when they form part of the plankton. [PDF]
Subphylum Vertebrata - What makes a vertebrate a vertebrate? They have more in common than a backbone. Find out more from the Animal Diversity Web.
Vertebrata - Introduction to the vertebrates and their classification, including the Hyperoartia, or lampreys, and the Gnathostomata, or jawed vertebrates.
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