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Ohioceras
''Ohioceras'' is an extinct suborthochonic nautiloid from the Silurian of Ohio belonging to the orthoceroid family Kionoceratidae. ''Ohioceras'' is characterized by a slightly curved longiconic shell with a circular to slightly depressed cross section. The surface is lined with broad, low, longitudinal ribs separated by distinct shallow grooves. The siphuncle is subcentral, apparently orthochoanitic. ==''References''==
* Sweet, Walter C. 1964. Nautiloidea-Orthocerida. Treatise on Invertebrate Paleontology, Part K. Geological Soc of America, and Univ Kansas Press. *( Ohioceras -Paleobio db ).
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Ohioceras」の詳細全文を読む
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