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Semionotid fish
Semionotid fish
© 2005 Yale Peabody Museum

Aelurodon taxoides
Aelurodon taxoides
© 2003 UCMP

© 2000 public domain

What are Vertebrates? Vertebrates, which include fish, birds, mammals, and more, are a very diverse group of animals. They come in all shapes and sizes, from the 8 millimeter-long goby (fish) to Argentinosaurus, a dinosaur that was 42 meters long. They live in all kinds of habitats, from the deep sea to the air, and from the tropics to the arctic. Some just have skin, but others have hair, feathers, scales, or other coverings. Vertebrates are chordates that have a backbone, and their fossil record extends back to the Cambrian.

Note: Their chordate relatives are discussed in Hemichordates and Chordates.

First known fossil occurrence: Cambrian.

Last known fossil occurrence: Quaternary. This group has living relatives.

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