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| display parents = 3 }} The paropsonemids are problematic fossils known from the Ordovician to Devonian periods, which may be related to the Cambrian eldoniids. They are typified by the Chengjiang genus ''Paropsonema''. ==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「Paropsonemid」の詳細全文を読む スポンサード リンク
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