| Rhadalognathus Temporal range: Triassic | |
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| Genus: | †Rhadalognathus |
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Rhadalognathus was a prehistoric crocodile-like amphibian that belongs to the Mastodonsauridae family. Not much is known about this creature but it lived in the Triassic period. [1] [2] [3] [4] Rhadalognathus is also the name of the genus in which the organism belongs within. Rhadalognathus was found in northern Arizona, US, by S. P. Welles in 1947. [2] The size of the organism is unknown but its skull is about 17in long and weighs 7lbs.