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Pontolis
''Pontolis'' was a large species of pinniped closely related to a modern-day walrus. It contained only the single species ''Pontolis magnus''.〔(【引用サイトリンク】title=Pontolis )〕 An amphibious carnivore, it was found in formerly marine or coastal areas in what is now California and Oregon, dating between 11.608 and 5.332 million years ago, during the Miocene and Pliocene.〔 ==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「Pontolis」の詳細全文を読む
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