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Wikipedia definition
1. MastodonsaurusMastodonsaurus (meaning "breast tooth lizard") was a large-headed temnospondyl that belonged to a group of advanced, mostly Triassic amphibians called capitosaurids. It was a giant among the stegocephalians and the largest animal of its time (late Triassic, 200 MYA). It looked like a huge frog, but instead of being semicircular, as in frogs, its head was triangular and reached 1.25 m. in length, the total length of the animal would be about 4–6 meters.
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