Crocodilia

order of large reptiles

The Order Crocodilia is a group of Archosaur reptiles. There are three living families.

Crocodilia
Temporal range: Upper Cretaceous – Recent
Crocodylus acutus mexico 01.jpg
American crocodile (Crocodylus acutus)
Scientific classification
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Crocodilia

Owen, 1842
Families

Crocodilians are the nearest living relatives to birds, because they are both survivors of the Archosaurs.

Crocodilians are first found in the Upper Cretaceous period. They are descendents of a much wider group of Archosaurs called the Crocodylomorphs. These, in the Upper Triassic, were slender land-living forms, the sister group of the dinosaurs. Now birds are their closest living relatives.

The Crocodylomorphs, in turn, were part of an even larger group, the Crurotarsi, which are first seen early in the Triassic.

TaxonomyEdit


 
Distribution of crocodiles