Chordata «
http://tolweb.org/tree?group=Chordata&contgroup=Animals | | Overview of the taxonomy of phylum chordata , which includes the well-known vertebrates (fishes , amphibians , reptiles , birds , mammals) , hagfishes , tunicates , and lancelets. |
Gnathostomata «
http://ag.arizona.edu/ENTO/tree/eukaryotes/animals/chordata/gnathostomata.html | | Philippe janvier's article about the jawed vertebrates in the tree of life website. |
Phylum Chordata «
http://animaldiversity.ummz.umich.edu/chordata.html | | 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. |
Subphylum Vertebrata «
http://animaldiversity.ummz.umich.edu/vertebrata.html | | 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. |
Vertebrata «
http://tolweb.org/tree?group=Vertebrata&contgroup=Craniata | | Introduction to the vertebrates and their classification , including the hyperoartia , or lampreys , and the gnathostomata , or jawed vertebrates. |
