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Crocodylus gariepensis
''"Crocodylus" gariepensis'' is an extinct species of crocodile that lived in southern Africa during the Early Miocene about 17.5 million years ago (Ma). Fossils have been found along a bank of the Orange River in Namibia, near its border with South Africa.〔
When the species was named in 2003, it was hypothesized to be ancestral to the living Nile crocodile, ''Crocodylus niloticus''. During this time the fossil record of ''C. niloticus'' was thought to extend back into the Late Miocene, meaning that ''"C." gariepensis'' could have been a direct precursor to the species. More recent studies propose that ''C. niloticus'' first appeared much more recently, making ''"C." gariepensis'' an unlikely ancestor of the Nile crocodile. Moreover, the most recent phylogenetic studies of crocodiles place ''"C." gariepensis'' in an evolutionary position outside most other species of ''Crocodylus'', far from the position of ''C. niloticus''.〔 These studies place it in a clade informally called "mecistopins", which includes the living slender-snouted crocodile ''Mecistops'' and the extinct genus ''Euthecodon''. Since ''"C." gariepensis'' does not fall within the genus ''Crocodylus'' defined in its strictest sense (''Crocodylus'' sensu stricto), its name is shown in quotation marks.
Although much of Namibia is currently arid, ''"C." gariepensis'' lived during a time when the local climate was humid and subtropical. It likely inhabited gallery forests surrounding the Orange River. Fossils of giant tortoises and a variety of small burrowing mammals have been found in the same deposits.〔
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Crocodylus gariepensis」の詳細全文を読む
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