{{Short description|Extinct superfamily of ammonites}} {{Automatic taxobox | fossil_range ={{fossilrange|Bajocian|Barremian}} | image = Exhibit Museum of Natural History, Ann Arbor - IMG 9178.JPG | image_caption = ''Idoceras balderum'' | taxon = Perisphinctoidea | authority = Steinmann, 1890 | subdivision_ranks = Families | subdivision = See text | synonyms = * Perisphinctaceae }}
'''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.<ref name="Arkell1957">{{cite book| first1=W.J. |last1=Arkell |first2=B. |last2=Kummel |first3=C.W. |last3=Wright |series=Treatise on Invertebrate Paleontology, Part L, Mollusca 4| title=Mesozoic Ammonoidea | publisher=Geological Society of America and University of Kansas Press |location=Lawrence, Kansas|year=1957}}</ref>
==Classification== Some 16 families have been recognized in the Perisphinctoidea. The following is based on Donovan ''et al.'' 1981<ref name=DCH>Donovan, Callomon and Howarth 1981 Classification of the Jurassic Ammonitina; Systematics Association. {{cite web |url=http://www.rogov.zwz.ru/Donovan,%20Callomon,%201981_J%20Ammon.PDF |title=Archived copy |access-date=2010-11-20 |url-status=dead |archive-url=https://web.archive.org/web/20110716054651/http://rogov.zwz.ru/Donovan,%20Callomon,%201981_J%20Ammon.PDF |archive-date=2011-07-16 }}</ref> with modification from the Treatise on Invertebrate Paleontology, Part L (1957)<ref name="Arkell1957"/> *Perisphinctidae: Middle and Upper Jurassic root stock, derived from the Stephanoceratidae
(Middle Jurassic direct derivatives of the Perisphinctidae) *Morphoceratidae *Tulitidae *Reineckeiidae *Pachyceratidae *Aspidoceratidae
(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)(now placed in the suberfamily Desmoceratoidea)
(Lower Cretaceous Perisphinctoidea (Berriasan - Hauterivien) *Berriasellidae (derived from Ataxioceratidae)(now considered a subfamily of Neocomitidae) *Polytichitidae [=Craspeditidae] (derived from Dorsoplanitidae) *Neocomitidae (derived from Berriasellidae)(now placed in the superfamily Endemoceratoidea) *Oosterellidae (Hauterivian derivative of the Neocomitidae)
==References== {{Wikispecies}} {{Portal|Paleontology}} {{Reflist}}
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Category:Perisphinctoidea Category:Ammonitina Category:Prehistoric animal superfamilies Category:Bajocian first appearances Category:Early Cretaceous extinctions
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