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Oppeliidae are compressed to oxyconic, sculptured Haplocerataceae, either unkeeled, unicarinate, bicarinate, or tricarinate; with sutures in great variety, but ribbing usually more or less falcoid or falcate. The Oppeliidae is the principal family of the Haplocerataceae, with the longest durantion, extending from the Middle Jurassic (Bajocian) to the Upper Cretaceous (Cenomanian) Their derivation is from the Hildocerataceae. ==Subfamilies== Nine subfamilies are recognized, the first 8 of which are include in the earlier Treatise, Part L. They are the :Oppeliinae :Hecticoceratinae :Distchoceratinae :Teramelliceratinae :Phlycticeratinae :Streblitinae :Mazapilitinae :Aconeceratinae :Binneyitinae The Binneyitinae was added by Donovan ''et al'', 1981. transferred from the Stephanocerataceae. 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「Oppeliidae」の詳細全文を読む スポンサード リンク
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