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The Ptychitacheae is a superfamily of typically involute, subglobular to discoidal Ceratitida in which the shell is smooth with lateral folds or strigations, inner whorls are globose, and the suture is commonly ammonitic. Their range is Middle_ and Upper Triassic. In its present configuration the Ptychitaceae includes three families, the: *Ptychitidae *Eosagenitidae *Sturiidae This differs from the taxonomy in the Treatise, Part L, in which the Ptychitaceae included the : * Ptychitidae : * Isculitidae : * Nannititdae The Isculitidae have since been removed to the Pinacocerataceae and the Nannitidae to the Danubitaceae. Fossils of the Ptychitaceae have been found in the Triassic of California and Nevada in the United States; British Columbia and Nunavut in Canada; Italy, Switzerland, and Hungary in Europe; Russia, China, and Afghanistan in Eurasia; Tunisia, Oman, Malaysia, and Papua New Guinea. ==''References''== *Treatise on Invertebrate Paleontology, Part L, Ammonoidea. R. C. Moore (ed). Geological Society of America and Univ of Kansas press, 1957 *( superfamily Ptychitaceae Mojsisovics 1882 ) ( Paleobiology DB ) 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「Ptychitaceae」の詳細全文を読む スポンサード リンク
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