Acanthostega
Link between fish and amphibian

Acanthostega is an extinct genus of stem-tetrapod, among the first vertebrate animals to have recognizable limbs. It appeared in the late Devonian period about 365 million years ago, and was anatomically intermediate between lobe-finned fishes (such as Eusthenopteron) and those that were fully capable of coming onto land such as Ichthyostega. Acanthostega was adapted for what they call terrestrial-style feeding, strongly supporting the hypothesis that the terrestrial mode of feeding first emerged in aquatic animals.

(See Acanthostega)

 

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