- Chordata - Overview of the taxonomy of Phylum Chordata, which includes the well-known vertebrates (fishes, amphibians, reptiles, birds, mammals), hagfishes, tunicates, and lancelets.
tolweb.org/tree?group=Chordata&contgroup=Animals
- Gnathostomata - Philippe Janvier's article about the jawed vertebrates in the Tree of Life website.
ag.arizona.edu/ENTO/tree/eukaryotes/animals/chordata/gnathostomata.html
- 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.
animaldiversity.ummz.umich.edu/chordata.html
- Subphylum Vertebrata - What makes a vertebrate a vertebrate? They have more in common than a backbone. Find out more in this site from the Animal Diversity Web.
animaldiversity.ummz.umich.edu/vertebrata.html
- Vertebrata - Introduction to the vertebrates and their classification, including the Hyperoartia, or lampreys, and the Gnathostomata, or jawed vertebrates.
tolweb.org/tree?group=Vertebrata&contgroup=Craniata
- Vertebrate Phylogeny - Cladograms with short articles and illustrations by Jack Conrad.
www.geocities.com/CapeCanaveral/Hall/1636
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