New cephalopod material from the Bashkirian (Middle Carboniferous) of the Ichinotani Formation, Central Japan
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概要
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Three Bashkirian (Middle Carboniferous) species of orthocerid cephalopods, the orthoceratid Hidamichelinoceras bandoi gen. et sp. nov. and the pseudorthoceratids Mooreoceras sp. and Adnatoceras ichinotaniense Niko and Hamada, 1987, are described (or redescribed) from the Ichinotani Formation, Central Japan based on new material. The siphuncular structure of Hidamichelinoceras is shared with Michelinoceras, but this new genus is characterized by its broadly cone-shaped initial camera and rapid shell expansion. The discovery of Mooreoceras, which previously had been known only from the Hikoroichi Formation in Japan, supports a paleobiogeographic link between the Fukuji and southern Kitakami areas in the Carboniferous. The apical shell diagnosis of Adnatoceras ichinotaniense is added.
- 日本古生物学会の論文
- 2000-12-30
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