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''Stearoceras'' is an extinct prehistoric nautiloid genus from the Lower Pennsylvanian (Upper Carboniferous) - Lower Permian with a fair worldwide distribution.(Kümmel 1964) ''Stearoceras'' is recognized by its involute shell with a depressed subtrapizoidal whorl section and slight ventral and lateral lobes. In contrast Stenoporceras is subdiscoidal and has a suture with broad lateral lobes and a deep ventral saddle as found in syringonautilids.(ibid) Nautiloids are a subclass of shelled cephalopods that were once diverse and numerous but are now represented by only a handful of species. ==''References''== * Kümmel, B. 1964. Nautiloidea -Nautilida; Treatise on Invertebrate PaleontologyPart K, Curt Teichert & R.C Moore,(eds) Geological Society of America & Univ. Kansas Press. * Sepkoski, J.J. Jr. 2002. A compendium of fossil marine animal genera. D.J. Jablonski & M.L. Foote (eds.). ''Bulletins of American Paleontology'' 363: 1–560. (Sepkoski's Online Genus Database (CEPHALOPODA) ) 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「Stearoceras」の詳細全文を読む スポンサード リンク
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