Crocodylia is an order of large reptiles that branched off of from class Reptilia about 220 million years ago.

• Order CROCODYLIA
  • Suborder: Eusuchia
  • Family: Crocodylidae
    • Subfamily: Crocodylinae
      • American Crocodile Crocodylus acutus
      • Slender-snouted Crocodile Crocodylus cataphractus
      • Orinoco Crocodile Crocodylus intermedius
      • Australian Freshwater Crocodile Crocodylus johnstoni
      • Philippine Crocodile Crocodylus mindorensis
      • Morelet's Crocodile Crocodylus moreletii
      • Nile Crocodile Crocodylus niloticus
      • New Guinea Crocodile Crocodylus novaeguineae
      • Mugger/Marsh Crocodile Crocodylus palustris
      • Estuarine/Saltwater Crocodile Crocodylus porosus
      • Cuban Crocodile Crocodylus rhombifer
      • Siamese Crocodile Crocodylus siamensis
      • Dwarf Crocodile Osteolaemus tetraspis
      • False Gharial/Gavial Tomistoma schlegelii
    • Subfamily: Alligatorinae (alligators and caimans)
      • American Alligator Alligator mississippiensis
      • Chinese Alligator Alligator sinensis
      • Common Caiman Caiman crocodilus
        • Bespectacled Caiman Caiman crocodilus crocodilus
        • Brown Caiman Caiman crocodilus fuscus
        • Rio Apaporis Caiman Caiman crocodilus apaporiensis
        • Yacare Caiman Caiman crocodilus yacare
      • Broad-snouted Caiman Caiman latirostros
      • Cuvier's Smooth-fronted Caiman Paleosuchus palpebrosus
      • Scheider's Smooth-fronted Caiman Paleosuchus trigonuatus
      • Black Caiman Melanosuchus niger
    • Subfamily: Gavialinae (Gavial)
      • Gharial Gavialis gangeticus