The Phylum Chordata, the chordates, is the part of the Animal Kingdom containing organisms that possess a structure called a notochord, at least during some part of their development. The best known chordates are the vertebrates (fishes, amphibians, reptiles, birds, mammals). The vertebrates and hagfishes together comprise the taxon Craniata. Also included in the phylum are the tunicates (Urochordata) and lancelets (Cephalochordata). Some extinct groups are also assigned to this phylum.

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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.
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.
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.
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.
Tree of Life: Gnathostomata
Philippe Janvier's article about this clade which differs from all other vertebrates in having a vertically biting device, the jaws.
Vertebrata
Introduction to the vertebrates and their classification, including the Hyperoartia, or lampreys, and the Gnathostomata, or jawed vertebrates.

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December 7, 2016 at 21:05:08 UTC
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