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Orthoceratid cephalopods from the Early Devonian Fukuji Formation of Gifu Prefecture, central Japan

Published online by Cambridge University Press:  20 May 2016

Shuji Niko*
Affiliation:
Department of Environmental Studies, Faculty of Integrated Arts and Sciences, Hiroshima University, Hiroshima 730, Japan

Abstract

Gedinnian (Early Devonian) orthoceratid cephalopods were previously not well known in Japan. Five species are described from the Fukuji Formation of Gifu Prefecture, central Japan: Michelinoceras yamakoshii n. sp., Michelinoceras yoshikiense n. sp., Plagiostomaceras? sp., Polygrammoceras sp., and Metaspyroceras insignis n. sp. Growth and position of the cameral deposits in Michelinoceras indicate that the deposits precipitated from cameral fluids and living Michelinoceras maintained the shell horizontally in swimming orientation.

Type
Research Article
Copyright
Copyright © The Paleontological Society 

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