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''Rhineceras'' is an extinct genus from the nautilid family Trigonoceratidae which is part of the Trigonocerataceae, that lived during the Mississippian Period in the late Paleozoic. ''Rhineceas'' is described in the Treatise, in Kummel, 1964, as being evolute with volutions in contact but not deeply impressed at maturity and the whorl section elliptical and depressed; the conch (shell) bearing prominent longitudinal ridges, which may be spinose. ''Rhinceras'' is illustrated, fig. 311-4 p. K429, as a closely coiled gyrocone of about two volutions, whorls not in contact. Longitudinal ridges (ribs) are shown. The illustration is designated as ''R. propinquum'' (DeKoninck), the type. ''Rhineceras'' is similar to ''Pararineceras'', ''Thrincoceras'', ''Discitoceras'', and ''Chouteauoceras'' in that all are covered by numerous longitudinal ridges. ''Rhineceras'' was named by Hyatt in 1893. It is based on ''Gyroceras propinquum'' DeKoninck, 1880, found in the Lower Carboniferous of Belgium. ==''References''== * Kummel, B, 1964; Nautiloidea- Nautilida; Treatise on Invertebrate Paleontology Part K Nautiloidea; Geological Society of America and University of Kansas Press. 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「Rineceras」の詳細全文を読む スポンサード リンク
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