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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.
http://animaldiversity.ummz.umich.edu/chordata.html
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Vertebrata
Introduction to the vertebrates and their classification, including the Hyperoartia, or lampreys, and the Gnathostomata, or jawed vertebrates.
http://tolweb.org/tree?group=Vertebrata&contgroup=Craniata
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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.
http://tolweb.org/tree?group=Chordata&contgroup=Animals
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North American Wildlife
Includes photographs and information on a wide range of mammals and reptiles from Canada, the United States and Mexico. Includes fact sheets and distribution maps.
http://www.wildlifenorthamerica.com/
Wildlifenorthamerica.com ~
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