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Haploceratoidea
Haploceratoidea, formerly Haplocerataceae, is a superfamily of ammonoid cephalopods belonging to the Ammonitida that unites three families, Strigoceratidae, Oppeliidae, and Haploceratidae, listed below.
Haploceratoidea begins with all three families in the lower Middle Jurassic, Bajocian. Strigoceratidae is limited to the Bajocian but Oppeliidae, and Haploceratidae extend through the remaining Jurassic, well into the Cretaceous; the Oppeliidae into the middle Albian, the Haplocertidae only into the Valanginian.
==Diagnosis==
Haploceratoidea are typically compressed, discoidal Ammontida that may be keeled or unkeeled, tending to be oxyconic, with usually falcoid or falcate ribbing. The aptychi are paired and differ between families and have been found ''in situ'' in e.g. ''Oppelia subrudiata'' and in ''Pseudolissoceras''.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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