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Alligatoroidea is a superfamily of crocodilians that evolved in the Late Cretaceous period. Cladistically, Alligatoroidea is Alligator mississippiensis (the American alligator) and all crocodylians more closely related to A. mississippiensis than to either Crocodylus niloticus (the Nile crocodile) or Gavialis gangeticus (the gharial).[1]

Temporal range: Late Cretaceous - Recent, 83.5–0 Ma
Two american alligators.jpg
Alligators (shown above) and caimans are living members of the superfamily Alligatoroidea.
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Crocodilia
Clade: Brevirostres
Superfamily: Alligatoroidea
Gray, 1844


An alligator nest at Everglades National Park, Florida, United States
A. olseni fore limb
Alligator prenasalis fossil


  1. ^ Brochu, Christopher A. (May 2003). "Phylogenetic approaches toward crocodylian history". Annual Review of Earth and Planetary Sciences. 31: 360. doi:10.1146/