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|Noun||1.||Hynerpeton - earliest fossil amphibian ever found; of the Devonian; found in Pennsylvania|
amphibia, class Amphibia - the class of vertebrates that live on land but breed in water; frogs; toads; newts; salamanders; caecilians
amphibian genus - any genus of amphibians
Hynerpeton bassetti - fossil amphibian of the Devonian having well-developed forelimbs; found in Pennsylvania