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Unformatted text preview: Triassic. The major group of diapsids, the archosaurs (ruling reptiles) evolved in the later part of the Permian, and underwent a major adaptive radiation in the late Triassic. Today only the birds and crocodiles remain of the once dominant ruling reptile group. The first true crocodiles also appeared during the Triassic. Several other reptile groups, such as the Triassic phytosaurs, adapted to the environment that crocodiles lived in. Due to evolutionary convergence , these animals took on an outer semblance of crocodiles, even though there were numerous anatomical differences. The ancestral crocodiles fully occupied the phytosaur niche in the environment after the extinction of phytosaurs at the close of the Triassic....
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- Fall '10