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''Macrodomoceras'' is an oncocerid genus, family Polyelasmoceratidae, from the Middle Devonian of Australia. The shell of ''Macrodomoceras'' is a compressed, endogastric cyrtocone, i.e section higher than wide and curved with the ventral side concave, with a subtriangular cross section. The siphuncle is ventral, marginal, with continuous actinosiphonate lamellae. ''Macrodomoceras'' resembles ''Danaoceras'' in its subtriangular cross section, but its sutures have bluntly pointed ventral saddles. ==References== * Walter C. Sweet, 1964. Nautiloidea - Oncocerida; Treatise on Invertebrate Paleontology, Part K. Geological Society of America. 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「Macrodomoceras」の詳細全文を読む スポンサード リンク
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