Devonohelicoceras hidaense, a new torticonic oncocerid (Cephalopoda) from the Lower Devonian of Central Japan

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概要

• 論文の詳細を見る

• Based on the four specimens from the Lower Devonian (Emsian?) D4 Member of the Fukuji Formation, and a specimen from an unknown locality, a new genus and species of the oncocerid cephalopod, Devonohelicoceras hidaense, is described as the second known oncocerid from Japan. The present genus is most similar to the Late Silurian genus Foersteoceras, but differs in its weakly depressed whorl section, submarginal siphuncle with positional shifting, and well-developed actinosiphonate deposits. It is likely that the actinosiphonate deposits functioned as a substratum of adhesive liquid which has a lower specific gravity than the sea water.(Communicated by Tatsuro MATSUMOTO, M. J. A., Sept. 12, 2003)

• 日本学士院の論文

著者

• Nishida T

  Saga Univ. Saga Jpn

• NIKO Shuji

  Faculty of Integrated Arts and Sciences, Hiroshima University

• NISHIDA Tamio

  Faculty of Culture and Education, Saga University

関連論文

• Devonohelicoceras hidaense, a new torticonic oncocerid (Cephalopoda) from the Lower Devonian of Central Japan
• First oncocerid cephalopod from Japan
• A new Permian species of Mooreoceras (Cephalopoda: Orthocerida) from northwestern Peninsular Malaysia
• Integrated biostratigraphic and radiometric study on the Lower Cenomanian (Cretaceous) of Hokkaido, Japan
• A study of Mrhiliceras (Cretaceous Ammonoidea) : Studies of the Cretaceous ammonites from Hokkaido and Sakhalin-XCIII

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