Chordata

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

Database of Vertebrates and Centres of Vertebrate Diversity in Mozambique
The Database includes almost 3500 vertebrate species, taxonomic information, English, Portuguese and vernacular names, conservation status and numerous maps illustrating biodiversity hotspots and locations of endemic species.
http://www.fzi.uni-freiburg.de/VertebratesMOC/

Gnathostomata
Philippe Janvier's article about the jawed vertebrates in the Tree of Life website.
http://ag.arizona.edu/ENTO/tree/eukaryotes/animals/chordata/gnathostomata.html

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/

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

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]
http://www.mba.ac.uk/nmbl/publications/occpub/guide/section17.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.
http://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.
http://tolweb.org/tree?group=Vertebrata&contgroup=Craniata