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Crown Tetrapoda

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Reptiliomorpha

Batrachomorpha. Amphibian. Evolutionary history[edit] Top: Restoration of Eusthenopteron, a fully aquatic lobe-finned fish Bottom: Restoration of Tiktaalik, an advanced tetrapodomorph fish.

Amphibian

Tetrapod. While most species today are terrestrial, little evidence supports the idea that any of the earliest tetrapods could move about on land, as their limbs could not have held their midsections off the ground and the known trackways do not indicate they dragged their bellies around.

Tetrapod

Presumably, the tracks were made by animals walking along the bottoms of shallow bodies of water.[2] Amphibians today generally remain semiaquatic, living the first stage of their lives as fish-like tadpoles. Several groups of tetrapods, such as the snakes and cetaceans, have lost some or all of their limbs.