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''Periodon'' is a genus of conodonts which existed in what is now Canada, Iran, Argentina, China, Russia, and the United States during the Ordovician Period. It was described by Hadding in 1913, and the type species is ''P. aculeatus''. ==Species== * ''Periodon flabellum'' Lindström, 1954 * ''Periodon zgierzensis'' Dzik, 1976 * ''Periodon aculeatus'' Hadding, 1913〔Dubinina, S. V., and A. V. Ryazantsev (2008), Conodont stratigraphy and correlation of the Ordovician volcanogenic and volcanogenic sedimentary sequences in the South Urals, Russ. J. Earth Sci., 10, ES5001, doi:10.2205/2008ES000302.〕 * ''Periodon selenopsis'' Serpagli, 1974〔(The Base of the Middle Ordovician Series Using Graphic Correlation Method ) Svend Stouge, Wang Xiofeng, Li Zhihong, Chen Xiaohong, and Wang Chuanshang.〕 * ''Periodon macrodentatus'' (Graves & Ellison 1941) * ''Periodon hankensis'' Svend Stouge, 2012 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「Periodon」の詳細全文を読む スポンサード リンク
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