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A. olseni fore limb. Alligator prenasalis fossil. The superfamily Alligatoroidea includes all crocodilians (fossil and extant) that are more closely related to the American alligator than to either the Nile crocodile or the gharial. [1] This is a stem-based definition for alligators, and is more inclusive than the crown group Alligatoridae. [2]
Phylogeny. Cladistically, Alligatoroidea is defined as 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). [7] This is a stem-based definition for alligators, [8] and is more inclusive ...
Alligator sinensis. † Alligator thomsoni. An alligator, or colloquially gator, is a large reptile in the genus Alligator of the family Alligatoridae of the order Crocodilia. The two extant species are the American alligator (A. mississippiensis) and the Chinese alligator (A. sinensis).
List of crocodilians. Crocodilia is an order of mostly large, predatory, semiaquatic reptiles, which includes true crocodiles, the alligators, and caimans; as well as the gharial and false gharial. A member of this order is called a crocodilian, or colloquially a crocodile. The 9 genera and 28 species of Crocodilia are split into 3 subfamilies ...
Alligatorinae. † Navajosuchus? Alligatorinae is a subfamily within the family Alligatoridae that contains the alligators and their closest extinct relatives, and is the sister taxon to Caimaninae (the caimans). Many genera in Alligatorinae are described, but only the genus Alligator is still living, with the remaining genera extinct.
Crocodilia (or Crocodylia, both / krɒkəˈdɪliə /) is an order of semiaquatic, predatory reptiles known as crocodilians. They first appeared during the Late Cretaceous and are the closest living relatives of birds. Crocodilians are a type of crocodylomorph pseudosuchian, a subset of archosaurs that appeared about 235 million years ago and ...