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''Trochoceras'' is a trochoidally coiled nautiloid cephalopod placed in the nautilid family Rutoceratidae that lived during the Middle and Late Devonian in what is now central Europe. The ''Trochoceras'' shell is a narrow, smooth, offset gyrocone consisting of little more than a single whorl, trochoidally grown in the sense of left hand screw. The phragmocone, with chambers, is ovate in cross section; the body or living chamber, quadrangular, with two pairs of winglike processes, one at the aperture and one at its base. The siphuncle is ventral, segments fusiform. ''Trochoceras'' resembles the rutoceratid ''Ptenoceras'' except the latter has a planar gyroconic shell with narrow projections extending laterally from the body chamber. ==Species== * ''Trochoceras regale'' Barrande, 1848 * ''Trochoceras davidsoni'' Barrande * ''Trochoceras baeri'' * ''Trochoceras mccharlesi'' 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「Trochoceras」の詳細全文を読む スポンサード リンク
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