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Alligator prenasalis : ウィキペディア英語版 | Alligator prenasalis
''Alligator prenasalis'' is an extinct species of alligator. It is well known, with many fossils having been collected from the Oligocene Chadron and Brule Formations in South Dakota. The species was first named in 1904, but was originally classified as a crocodile in the genus ''Crocodilus''. It was reassigned to the genus ''Alligator'' in 1918 on the basis of more complete material. It is the earliest known member of the genus ''Alligator''. ==Taxonomy==
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