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phylum Chordata Acanthostega (meaning spiny roof) is among the first vertebrate animals to have recognizable limbs. It appeared in the Upper Devonian (Famennian) about 365 million years ago, and was anatomically intermediate between lobe-finned fishes and the first tetrapods fully capable of coming onto land.

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class "Amphibia"(wide sense)
family Acanthostegidae
genus Acanthostega
Period Late Devonian