Tetrapod

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Elginerpetontidae

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Acanthostegidae

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Ichthyostegidae

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:Whatcheeriidae

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:Crassigyrinidae

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:Baphetidae

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:Colosteidae

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:Batrachomorpha/Amphibia

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:Lepospondyli

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:Reptiliomorpha

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::Amniota

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:::Sauropsida/Reptilia

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::::Aves (Birds)

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:::Synapsida

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::::Mammalia

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A tetrapod (Greek tetrapoda, "four-legged") is a vertebrate animal having four feet, legs or leglike appendages. Since amphibians, reptiles, dinosaurs and mammals are all tetrapods, and even birds and snakes are tetrapods by descent, the term is only really useful in describing the earliest tetrapods, which radiated from the Sarcopterygii, or "lobe-finned" fishes, into air-breathing amphibians in the Devonian period.

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The Latin version of "tetrapod" is "quadruped," meaning any four-legged creature.

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Amphibia: REDIRECT Amphibian...

Sauropsida: Carboniferous ? Recent...

Reptilia: REDIRECT Reptile...