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Kentlandoceras : ウィキペディア英語版 | Kentlandoceras
''Kentlandoceras'' is a middle Ordovician Oncocerid genus (family Oncoceratidae). Its shell is curved exogastrically, such that the ventral margin is longitudianally convex, but less so than in ''Loganoceras'', and with a submarginal ventral siphuncle instead. The siphuncle in ''Loganoceras'' is subcentral. The related ''Romingoceras'' is more curved, also with a ventral siphuncle. All three genera are from the Middle Ordovician of North America. ==References==
* Walter C Sweet, 1964. Nautiloidea -Oncocerida; Treatise on Invertebrate Paleontology, Part K. Geological Society of America and University of Kansas Press. * (Kentlandoceras )], Paleobiology database.
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「Kentlandoceras」の詳細全文を読む
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