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''Polyptychoceras'' is an extinct genus of ammonite from the Late Cretaceous of Asia, Europe, and North〔 (【引用サイトリンク】title=Cretaceous Ammonite: Polyptychoceras )〕 and South America. It was first named by Hisakatsu Yabe in 1927.〔Tatsuro Matsumoto and Mitsutoshi Nihongi (1979) (An Interesting Mode of Occurrence of Polyptychoceras ) Japan Academy〕 ==Species and Subspecies== This genus contains the following eight species and one subgenus, ''Subtychoceras'', which contains one subspecies. 〔 *''Polyptychoceras mihoense'' *''Polyptychoceras pseudogaultinum'' could reach a length of 100 - 120 mm,〔 *''Polyptychoceras haradanum'' (Yokoyama) *''Polyptychoceras obatai'' *''Polyptychoceras obliquecostatum'' *''Polyptychoceras subunduratum'' *''Polyptychoceras obstrictum'' (Jimbo) *''Polyptychoceras vancouverensis'' located around the Trent River and Puntledge River.〔 Due to its shape, collectors of ''P. vancouverensis'' fossils often call it the "paperclip ammonite" or "candy cane".〔 *''Polyptychoceras (Subptychoceras) yubarense'' could reach a maximum length of 200 mm.〔 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「Polyptychoceras」の詳細全文を読む スポンサード リンク
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