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

Autor:	Shuji Niko
Rok vydání:	1993
Předmět:	0106 biological sciences 010506 paleontology Paleontology biology Shell (structure) Michelinoceras biology.organism_classification 010603 evolutionary biology 01 natural sciences Geology Devonian 0105 earth and related environmental sciences
Zdroj:	Journal of Paleontology. 67:210-216
ISSN:	1937-2337 0022-3360
DOI:	10.1017/s0022336000032133
Popis:	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.
Databáze:	OpenAIRE
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