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''Oenonella'' is an extinct genus from a well-known class of fossil marine arthropods, the trilobites. It lived during the later part of the Arenig stage of the Ordovician Period,〔 approximately 478 to 471 million years ago. ==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「Oenonella」の詳細全文を読む スポンサード リンク
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