The range of its habitat is also Nebraska. Little is known about the Alligator thomsoni, except that it lived in the Early Miocene period. mooki because of their physical similarities. Palaeontologists consider this species as ancestral to the A. prenasalis has some similarities with the Allognathosuchus mooki, an alligatorine. It was in 1918 when it was re-assigned as an alligator. However, it was originally thought of as a crocodile. The species’ name became official in 1940. The fossils came from the Chadron and Brule Formations located in South Dakota.
There are many fossils that have been collected, so there is a hefty amount of data about it. This one lived in the Late Eocene period. The Alligator Olseni is small than its modern counterpart. The first fossils were found at the Thomas Site Farm as early as 1931. However, it was named after its preparator, Russel Olsen. There is a possibility that this alligator also expanded its territory as far as southeastern Texas. Unlike the previous extinct alligators, this one lived in Florida, not Nebraska. Some scientists surmise that it lived between 20 and 15 million years ago. Like the Alligator mcgrewi, it also lived during the Early Miocene period. Alligator olseniĪlso called Olsen’s Alligator, this species was named after Russel Olsen. mefferdi belongs to the sub-family Alligatorinae, which is under the bigger family of Alligatoridae. There is also a greater degree of cranial ornamentation compared to the modern alligator.īy taxonomy, the A.
However, it has a shorter and blunter snout compared to the modern extant species. The Alligator mefferdi is the closest relative of the modern American alligator. The first specimen was discovered in the Ash Hollow Formation, which is also located in Nebraska. They lived in the Miocene period, and their habitat spanned across Nebraska. The first A lligator mefferdi became known after Charles Craig Mook described it. If the hypothesis is correct, then this alligator is one of the shortest and lightest of all species. Based on the length of the fossil, the estimated body mass of this extinct alligator was three kilograms. The average measurement of the skull was 145 x 96 millimeters. Based on scientific findings, it was a marine crocodile, and scientists tagged it this way based on its closeness to the Mesoeucrocodylia. Like the American alligator, it was only found in the United States, particularly in Nebraska. The Alligator mcgrewi lived in the early Miocene period. Specifically, these species are the modern American alligator ad the extinct Alligator Mefferdi. Its age and fossil serve as an evolutionary intermediate between other species. The name comes from the town of Haile, where it was first found. This alligator is one of the larger species, and it lived in Florida during the Pleistocene period. Related: All 27 Types of Crocodiles Types of Extinct Alligators 1. It is a nocturnal hunter during summer, and it is an opportunistic feeder. Unlike its American cousin, it is smaller, growing only to seven feet and weighing up to 100 pounds.ĭuring the summer, it burrows in the ground, and it brumates in the winter. The Chinese alligator is either dark grey or black, and its body is also fully-armored.
Some People call it the Yangtze alligator or China alligator. It is endemic to China, and it is revered as the muddy dragon. The Chinese alligator is an endangered species.
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