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.Gnathostomata - Philippe Janvier's article about the jawed vertebrates in the Tree of Life website.
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.
Chordata - Overview of the taxonomy of Phylum Chordata, which includes the well-known vertebrates (fishes, amphibians, reptiles, birds, mammals), hagfishes, tunicates, and lancelets.
Vertebrate Phylogeny - Cladograms with short articles and illustrations by Jack Conrad.
Phylum Chordata - Introduction to the taxonomy, characteristics, and anatomy of the chordates, provided in the form of a university slide lecture.
Vertebrata - Introduction to the vertebrates and their classification, including the Hyperoartia, or lampreys, and the Gnathostomata, or jawed vertebrates.
