# Perisphinctoidea

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{{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](/source/Gustav_Steinmann), 1890
| subdivision_ranks = Families
| subdivision =  See text
| synonyms = 
* Perisphinctaceae
}}

'''Perisphinctoidea''', formerly '''Perisphinctaceae''', is a superfamily of Middle [Jurassic](/source/Jurassic) (Bajocian) to [Lower Cretaceous](/source/Lower_Cretaceous) (Barremian) [ammonites](/source/Ammonitina), 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)](/source/Treatise_on_Invertebrate_Paleontology)<ref name="Arkell1957"/>
 
*[Perisphinctidae](/source/Perisphinctidae):  Middle and Upper Jurassic root stock, derived from the [Stephanoceratidae](/source/Stephanoceratidae)

(Middle Jurassic direct derivatives of the  Perisphinctidae)
*[Morphoceratidae](/source/Morphoceratidae)
*[Tulitidae](/source/Tulitidae)
*[Reineckeiidae](/source/Reineckeiidae)
*[Pachyceratidae](/source/Pachyceratidae)
*[Aspidoceratidae](/source/Aspidoceratidae)

(early Upper Jurassic (Oxfordian) derivatives of Perisphinctidae)
*[Aulacostephanidae](/source/Aulacostephanidae)
*[Ataxioceratidae](/source/Ataxioceratidae)

(mid Upper Jurassic (Kimmeridgian) derivatives of the Ataxioceratidae)
*[Dorsoplanitidae](/source/Dorsoplanitidae)
*[Virgatitidae](/source/Virgatitidae)

(late Upper Jurassic (Tithonian)  derivatives of Perisphinctidae) 
*[Simoceratidae](/source/Simoceratidae)
*[Himalayitidae](/source/Himalayitidae)
*[Olcostephanidae](/source/Olcostephanidae)
*[Holcodiscidae](/source/Holcodiscidae) (indirect, from Olcostaphanidae)(now placed in the suberfamily Desmoceratoidea)

(Lower Cretaceous Perisphinctoidea (Berriasan - Hauterivien) 
*[Berriasellidae](/source/Berriasellidae) (derived from Ataxioceratidae)(now considered a subfamily of Neocomitidae)
*[Polytichitidae](/source/Polytichitidae) [=[Craspeditidae](/source/Craspeditidae)] (derived from Dorsoplanitidae)
*[Neocomitidae](/source/Neocomitidae) (derived from Berriasellidae)(now placed in the superfamily  Endemoceratoidea)
*[Oosterellidae](/source/Oosterellidae) (Hauterivian derivative of the Neocomitidae)

==References==
{{Wikispecies}}
{{Portal|Paleontology}}
{{Reflist}}

{{Taxonbar|from=Q7168769}}

Category:Perisphinctoidea
Category:Ammonitina
Category:Prehistoric animal superfamilies
Category:Bajocian first appearances
Category:Early Cretaceous extinctions

{{ammonitina-stub}}

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Adapted from the Wikipedia article [Perisphinctoidea](https://en.wikipedia.org/wiki/Perisphinctoidea) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Perisphinctoidea?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.