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1 Evolution. 2 Phylogeny. 3 Species. Toggle Species subsection. 3.1 Extant. 3.2 Extinct. ... is a large reptile in the genus Alligator of the family Alligatoridae in ...
Alligatorinae is cladistically defined as Alligator mississippiensis (the American alligator) and all species closer to it than to Caiman crocodylus (the spectacled caiman). [ 8 ] [ 9 ] This is a stem-based definition for Alligatorinae, and means that it includes more basal extinct alligator ancestors that are more closely related to living ...
Alligator sinensis Chinese alligator Alligator mississippiensis American alligator The below detailed cladogram shows one proposal for the internal relationships within Alligatoridae including fossil species, based on morphological analysis [ 6 ] (although the exact alligatoroid phylogeny is still disputed).
An alligator nest at Everglades National Park, Florida, United States Alligator olseni forelimb Alligator prenasalis fossil. The superfamily Alligatoroidea is thought to have split from the crocodile-gharial lineage in the late Cretaceous, about 80 million years ago, but possibly as early as 100 million years ago based on molecular phylogenetics.
This alligator and the American alligator are now considered to be sister taxa, suggesting that the A. mississippiensis lineage has existed in North America for seven to eight million years. [ 1 ] The alligator's full mitochondrial genome was sequenced in the 1990s, and it suggests the animal evolved at a rate similar to mammals and greater ...
Regardless of the absence of a phylogeny, Darlim et al. are confident in assigning this species to the genus Alligator based on a number of shared traits. Within Alligator, A. munensis shows many similarities to Alligator sinensis, suggesting the two were closely related. Nevertheless, the many derived features of this species indicate that the ...
Ahdeskatanka is an extinct genus of alligator from the Early Eocene Golden Valley Formation of North Dakota, USA. Ahdeskatanka had a short, rounded snout with globular teeth that are well-suited for crushing hard-shelled prey, though its exact ecology is not known.
Caimaninae is cladistically defined as Caiman crocodylus (the spectacled caiman) and all species closer to it than to Alligator mississippiensis (the American alligator). [ 8 ] [ 9 ] This is a stem-based definition for caimaninae, and means that it includes more basal extinct caimanine ancestors that are more closely related to living caimans ...