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Crocodylomorpha is a superorder of archosaurs that includes the crocodilians and their extinct relatives, dating back to the Late Triassic.

During Mesozoic and early Cenozoic times, Crocodylomorpha was far more diverse than it is now. Triassic forms were small, lightly built, active terrestrial animals. These were supplanted during the Early Jurassic by various aquatic and marine forms. The Late Jurassic, Cretaceous, and Cenozoic saw a wide diversity of terrestrial and semi-aquatic lineages. "Modern" crocodilians do not appear until the Late Cretaceous. Among the largest crocodylomorphs are the 7-metre-long Crocodylus anthropophagus, the 11-meter-long Sarcosuchus imperator, the 12-metre-long Deinosuchus hatcheri and the 9-metre-long Machimosaurus hugii.

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