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''Triodus'' is an extinct genus of xenacanthidan shark that lived in the Permian. It was a freshwater shark, and fossils have been found in Germany. ==Sources== *''The Rise of Fishes: 500 Million Years of Evolution'' by John A. Long 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「Triodus」の詳細全文を読む スポンサード リンク
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