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Psilocerataceae is a superfamily of Early Jurassic ammonoid cephalopods proposed by Hyatt in 1867, assigned to the order Ammonitida. Psilocerataceae is probably derived from the Ussuritidae, which are found in the Phylloceratida, and combines five families, the Psiloceratidae, Echioceratidae, Schlotheimiidae, Arietitidae, and Oxynoticeratidae. The Psiloceratidae, which is the ancestral and type family, provides the basic description for the group. ==Families Included== *Psiloceratidae - The Psiloceratidae are evolute, smooth or with blunt primary ribbing. The venter is rounded and generally smooth, in some feebly keeled. Sutures are simple with phylloid saddle endings in some. The aptychus is single, found ''in sutu'' in ''Psiloceras'' *Echioceratidae *Schlotheimiidae *Arietitidae *Oxynoticeratidae 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「Psilocerataceae」の詳細全文を読む スポンサード リンク
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