Alligatoridae

Alligators and caimans are archosaurs, species of crocodilians and form the family Alligatoridae (sometimes regarded instead as the subfamily Alligatorinae).

True alligators
Alligators proper occur in the fluvial deposits of the age of the Upper Chalk in Europe, where they did not die out until the Pliocene age.

Taxonomy

 * ORDER Crocodilia
 * Family Alligatoridae
 * Genus Leidyosuchus (extinct)
 * Genus Deinosuchus (extinct)
 * Subfamily Alligatorinae
 * Genus Albertochampsa (extinct)
 * Genus Chrysochampsa (extinct)
 * Genus Hassiacosuchus (extinct)
 * Genus Navajosuchus (extinct)
 * Genus Ceratosuchus (extinct)
 * Genus Allognathosuchus (extinct)
 * Genus Hispanochampsa (extinct)
 * Genus Arambourgia (extinct)
 * Genus Procaimanoidea (extinct)
 * Genus Wannaganosuchus (extinct)
 * Genus Alligator
 * Alligator prenasalis (extinct)
 * Alligator mcgrewi (extinct)
 * Alligator olseni (extinct)
 * Chinese Alligator, Alligator sinensis 
 * Alligator mefferdi (extinct)
 * American Alligator, ''Alligator mississippiensis
 * Subfamily Caimaninae
 * Genus Necrosuchus (extinct)
 * Genus Eocaiman (extinct)
 * Genus Paleosuchus
 * Cuvier's Dwarf Caiman, Paleosuchus palpebrosus
 * Smooth-fronted Caiman, Paleosuchus trigonatus
 * Genus Purussaurus (extinct)
 * Genus Mourasuchus (extinct)
 * Genus Orthogenysuchus (extinct)
 * Genus Caiman
 * Yacare Caiman, Caiman yacare
 * Spectacled Caiman, Caiman crocodilus 
 * Rio Apaporis Caiman, C. c. apaporiensis 
 * Brown Caiman, C. c. fuscus
 * Caiman lutescans (extinct)
 * Caiman sorontans (extinct) - Not reported in the literature, probably a 'nomen nudum'
 * Broad-snouted Caiman, Caiman latirostris 
 * Genus Melanosuchus
 * Melanosuchus fisheri (extinct)
 * Black Caiman, Melanosuchus niger