A revised taxonomy of the ammonoid genus Desmoceras from Japan and southern Sakhalin

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概要

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• Based on the stratigraphically well sorted material from Japan and southern Sakhalin, the ammonoid species belonging to the genus Desmoceras are classified as follows in ascending order: D. latidorsatum (Michelin) (Middle to mid-Upper Albian), D. dawsoni shikokuense (Yabe and Shimizu) (Upper Albian), D. kossmati Matsumoto (uppermost Albian-Lower Cenomanian), D. japonicum Yabe (uppermost Albian-Cenomanian), and D. ezoanum Matsumoto (mid-Upper Cenomanian-mid-Lower Turonian). D. japonicum can be subdivided into the earlier and later subspecies. D. poronaicum Yabe is a junior synonym of D. japonicum. Despite the scarcely ornamented shell, each taxon can be defined by its own characters. (Contributed by Tatsuro MATSUMOTO, M.J.A.)

• 日本学士院の論文

著者

• MATSUMOTO Tatsuro

  The Kyushu University Museum

• NISHIDA Tamio

  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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