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''Achistrum'' is an extinct genus of sea cucumber which existed in Poland during the Triassic period, and the United States during the Carboniferous period.〔(Triassic Holothurian Sclerites from Tatra Mountains ) Krystyna Zawidzka.〕 It contains the species ''Achistrum nicholsoni'' and ''Achistrum ludwigi''. ==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「Achistrum」の詳細全文を読む スポンサード リンク
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