Crocodilia

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

Crocodilians Temporal range: Upper Cretaceous – Recent
American crocodile (Crocodylus acutus)
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Sauropsida
(unranked):	Archosauria
Superorder:	Crocodylomorpha
Order:	Crocodilia Owen, 1842
Families
Gavialidae Alligatoridae Crocodylidae

Nile crocodiles

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

Crocodiles 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.

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

• Sauropsida
  • Archosauria
    • Crurotarsi
      • Crocodylomorphs
        • Crocodilia

Taxonomy

• Order Crocodilia
  • Family Crocodylidae
    • Crocodiles
  • Family Alligatoridae
    • Alligators
    • Caimans
  • Family Gavialidae
    • Gharial
    • False Gharial

Distribution of crocodiles