Living vertebrates can be divided into two major clades the cyclostomes and the gnathostomes.
Vertebrates include all animal taxa in the Vertebrata subphylum, which includes all mammals, birds, reptiles, amphibians, and fish. Vertebrates make up the vast majority of the phylum Chordata, with approximately 69,963 species currently described. The phylum chordata (backboned animals) is divided into five classes: fish, amphibians, reptiles, mammals, and birds.
Fishes, amphibians, reptiles, birds, and mammals are the five major groups of vertebrates. Classes include amphibians, reptiles, birds, and mammals. Myxini, Hyperoartia, Chondrichthyes, Actinopterygii, and Sarcopterygii are the five classes of fish.
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