Acanthostega gunnari

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Acanthostega gunnari is a basal tetrapod or four legged animal from the Upper Devonian of Greenland, which has shed significant light on the derivation and early evolution of tetrapods. Acanthostega challenges the previously held theory that the evolution of legs and feet were driven by creatures coming up on land from the water. Acanthostega had legs and feet but was aquatic, not an amphibian.

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