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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.
Alligators and caimans split in North America during the early Tertiary or late Cretaceous (about 53 million to about 65 million years ago). [4] [5] The Chinese alligator split from the American alligator about 33 million years ago [4] and probably descended from a lineage that crossed the Bering land bridge during the Neogene.
Alligators and caimans split in North America during the early Tertiary or late Cretaceous (about 53 million to about 65 million years ago). [3] [4] The Chinese alligator split from the American alligator about 33 million years ago [3] and likely descended from a lineage that crossed the Bering land bridge during the Neogene.
End Triassic: 200 million years ago, 80% of species lost, including all conodonts; End Cretaceous: 66 million years ago, ... First alligators and ruminants.
Researchers have wondered how an alligator-size arthropod lived more than 300 million years ago. The discovery of an intact Arthropleura head offers new insights.
Fossils identical to the existing American alligator are found throughout the Pleistocene, from 2.5 million to 11.7 thousand years ago. [17] In 2016, a Late Miocene fossil skull of an alligator, dating to approximately seven or eight million years ago, was discovered in Marion County, Florida. Unlike the other extinct alligator species of the ...
The pyrite that fossilized the specimen, named Lomankus edgecombei, "preserves critical evidence of the evolution of life in the oceans 450 million years ago," co-author Derek Briggs said in a ...
According to the Louisiana Department of Wildlife and Fisheries, "Louisiana’s wild alligator population has increased from less than 100,000 to more than 2 million in the past 50 years.