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Perisphinctoidea, formerly Perisphinctaceae, is a superfamily of Middle Jurassic (Bajocian) to Lower Cretaceous (Barremian) ammonites, commonly with evolute shells with strong ribbing that typically divides about mid flank before crossing the venter. ==Classification== Some 18 families have been recognized in the Perisphinctoidea. The following is based on Donovan ''et al.'' 1981〔Donovan, Callomon and Howarth 1981 Classification of the Jurassic Ammonitina; Systematics Association. ()〕 with modification from the Treatise on Invertebrate Paleontology, Part L (1957)〔 *Perisphinctidae: Middle and Upper Jurassic root stock, derived from the Stephanoceratidae (Middle Jurassic direct derivatives of the Perisphinctidae) *Morphiceratidae *Tulitidae *Reineckeiidae *Pachyceratidae *Aspodoceratidae (early Upper Jurassic (Oxfordian) derivatives of Perisphinctidae) *Aulacostephanidae *Ataxioceratidae (mid Upper Jurassic (Kimmeridgian) derivatives of the Ataxioceratidae) *Dorsoplanitidae *Virgatitidae (late Upper Jurassic (Tithonian) derivatives of Perisphinctidae) *Simoceratidae *Himalayitidae *Olcostephanidae *Holcodiscidae (indirect, from Olcostaphanidae) (Lower Cretaceous Perisphinctoidea (Berriasan - Hauterivien) *Polytichitidae () (derived from Dorsoplanitidae) *Berriasellidae (derived from Ataxioceratidae) *Neocomitidae(derived from Berriasellidae) *Oosterellidae (Hauterivian derivative of the Neocomitidae) 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「Perisphinctoidea」の詳細全文を読む スポンサード リンク
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