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Ptychodus
''Ptychodus'' is a genus of extinct hybodontiform sharks.〔Fossils (Smithsonian Handbooks) by David Ward (Page 200)〕 ==Etymology== The Genus name ''Ptychodus'' comes from the Greek words''ptychos'' (fold/layer) and ''odon'' (tooth), describing the shape of their crushing and grinding teeth that were recovered in deposits around the Niobrara Formation.〔 David, Michelle (A historical and mechanical description of Ptychodus (Chondrichthyes) dententions with notes on the distribution and systematics of the genus )〕
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「Ptychodus」の詳細全文を読む
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