Extant (living) Tetrapods
Following the great faunal turnover at the end of the Mesozoic, only six major groups of tetrapods were left, all of which also include many extinct groups:
- Lissamphibia : frogs and toads, newts and salamanders, and caecilians
- Testudines : turtles and tortoises
- Lepidosauria : tuataras, lizards, amphisbaenians and snakes
- Crocodilia : crocodiles, alligators, caimans and gharials
- Neornithes : modern birds
- Mammalia : mammals
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