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''Kosmoceratidae'' is an extinct ammonite family from the Callovian (Middle Jurassic) to Early Cretaceous. Kosmoceratidae are probably the most polymorphic groups of Jurassic ammonites. These ammonoids have a more or less tabulate venter, with lateral or ventrolateral tubercles. The aptychus is double valved with a concentrically ribbed surface. 〔 Treatise on invertebrate paleontology. Part F : America / edited by Raymond C. Moore. -- University of Kansas Press, 1956〕 ==Genera== 〔(Mikko's Phylogeny Archive )〕 * ''Kosmoceras'' * ''Kepplerites'' * ''Gulielmites'' * ''Sigaloceras'' 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「Kosmoceratidae」の詳細全文を読む スポンサード リンク
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