A pachydiscid ammonite Lewesiceras from the Cenomanian of Japan : Studies of the Cretaceous ammonites from Hokkaido and Sakhalin-XCVI

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概要

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• A specimen of ammonite obtained by Toshio Shimanuki from the lower Cenomanian (Cretaceous) outcrop in the Hobetsu district of Hokkaido, northern Japan, represents a new species of Lewesiceras (Pachydiscidae). In as much as Cenomanian specimens hitherto reported under Lewesiceras have been too immature for precise generic assignment, the present specimen is large enough to reach the adult stage. It represents a new species of Lewesiceras, and shows in some respects a step in the evolutionary change of characters from late Albian Eopachydiscus to the typical Turonian species of Lewesiceras.(Contributed by Tatsuro MATSUMOTO, M. J. A., Sept. 12, 2003)

• 日本学士院の論文

著者

• Matsumoto T

  Kyushu Univ. Museum Fukuoka Jpn

• MATSUMOTO Tatsuro

  The Kyushu University Museum

関連論文

• A pachydiscid ammonite Lewesiceras from the Cenomanian of Japan : Studies of the Cretaceous ammonites from Hokkaido and Sakhalin-XCVI
• A study of Mrhiliceras (Cretaceous Ammonoidea) : Studies of the Cretaceous ammonites from Hokkaido and Sakhalin-XCIII
• A revised taxonomy of the ammonoid genus Desmoceras from Japan and southern Sakhalin
• Turrilitid ammonoid Carthaginites from Hokkaido (Studies of the Cretaceous ammonites from Hokkaido and Sakhalin - XCIV)

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