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Rutoceratidae is a family of prototypical nautilids, derived probably from either Brevicoceratidae or Acleistoceratidae of the order Oncocerida early in the Devonian. Rutoceratidae comprise a family within the oncocerid superfamily Tainocerataceae〔 Kummel 1964, Nautiloidea-Nautilida; Treatise on Invertebrate Paleontology, Part K: Nautiloidea, Teichert & Moore (eds)〕 They are generally characterized by cyrtoconic and gyroconic shells, commonly with spines, nodes, or frills, although some included genera are almost orthoconic, and a commonly empty, tubular ventral siphuncle.〔 〔Flower and Kummel 1950; A Classification of the Nautiloidea; Journal of Paleontology, 24(50 606-616, Sept 1950〕 The Rutocertids lived during the Devonian and Mississippian (early Carboniferous) and are the ancestral stock of Nautilida.〔 Within the superfamily Taintocerataceae, rutoceratids gave rise to the exclusively Devonian family Tetragonoceratidae and near the start of the Mississippian to the family Koninkioceratidae which lasted into the Permian and to Tainoceratidae which lasted through most of the Triassic. ==Genera== * ''Adelphoceras'' * ''Anomaloceras'' * ''Casteroceras'' * ''Centrolitoceras'' * ''Diademoceras'' * ''Duerleyoceras'' * ''Goldringia'' * ''Halloceras'' * ''Hercoceras'' * ''Hindeoceras'' * ''Homoadelphoceras'' * ''Litogyroceras'' * ''Muiroceras'' * ''Pleuroncoceras'' * ''Ptenoceras'' * ''Ptyssoceras'' * ''Roussanoffoceras'' * ''Rutoceras'' * ''Syrreghmatoceras'' * ''Tetranodoceras'' * ''Threaroceras'' * ''Trochoceras'' * ''Tylorthoceras'' 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「Rutoceratidae」の詳細全文を読む スポンサード リンク
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