tetrapods

Tetrapods are four-limbed (with a few exceptions, such as snakes) vertebrates constituting the superclass Tetrapoda that includes living and extinct amphibians, reptiles, mammals, and birds. They evolved from a group of animals known as the Tetrapodomorpha which, in turn, evolved from ancient lobe-finned fishes (Sarcopterygii) around 390 million years ago in the middle Devonian period.