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''Mecynoceras'' is a Late Devonian oncocerid included in the Poterioceratidae, a family of subcircular to compressed exogastric cyrtocones without a hyponomic sinus. ''Mecynoceras'' has a compressed, gibbous cyrtoconic shell. The venter, especially of the chambered phragmocone is convex in profile; the body chamber long and tubular. Septa are transverse, close spaced; the siphuncle large, subcentral, with actinosiphonate deposits. ''Cyrtogomphus'', ''Lysagoroceras'', and ''Poterioceras'' are among related genera. ==References== * Walter C. Sweet, 1964. Nautiloidea-Oncocerida. Treatise on Invertebrate Paleontology, Part K. Geological Society of America. *(''Mecynoceras'' ) Fossilworks entry. 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「Mecynoceras」の詳細全文を読む スポンサード リンク
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