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|Noun||1.||genus Ichthyostega - second earliest fossil amphibian ever found; of the Devonian; found in Greenland|
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
Ichyostega - early tetrapod amphibian found in Greenland