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''Paradakeoceras'' is an early Ordovician cephalopod belonging to the nautiloid order Ellesmerocerida. == Morphology == The shell of ''Paradakeoceras'' is an expanding endogastric cyrtocone〔 with the siphuncle situated near the shell's concave margin. A raised ring exists at the base of the body chamber, which is often preserved as a mould.〔 ''Paradakeoceras'' was named by Flower, 1964,〔 for species previously included in ''Dakeoceras'' in which the cross section is broadened with consequent loss of lateral lobes in the suture. ''Paradakeoceras'' shows a flattening of the venter which distinguishes it from ''Quebecoceras'' and has a reduction in the rate of expansion similar to that of ''Dakeoceras''. 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「Paradakeoceras」の詳細全文を読む スポンサード リンク
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