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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 16 families have been recognized in the Perisphinctoidea. The following is based on Donovan ''et al.'' 1981Donovan, Callomon and Howarth 1981 Classification of the Jurassic Ammonitina; Systematics Association. with modification from the Treatise on Invertebrate Paleontology, Part L (1957) *
Perisphinctidae Perisphinctidae is a family of Middle and Upper Jurassic discoidal ammonites in the order Ammonitida. They have a shell morphology that is mostly evolute, typically with biplicate, simple, or triplicate ribbing. Large forms have simple aperture ...
: Middle and Upper Jurassic root stock, derived from the
Stephanoceratidae Stephanoceratidae is a family of planulate and coronate ammonites within the Stephanoceratoidea.Arkell, Kummel, and Wright, 1957. Mesozoic Ammonoidea; Treatise on Invertebrate Paleontology, Part L, Mollusca 4. Shells are evolute so that all whorl ...
(Middle Jurassic direct derivatives of the Perisphinctidae) * Morphiceratidae * Tulitidae *
Reineckeiidae Reineckeiidae is an extinct ammonoid cephalopod family belonging to the superfamily Perisphinctoidea. These fast-moving nektonic carnivores lived during the Jurassic period, from the Callovian In the geologic timescale, the Callovian is an age ...
* Pachyceratidae *
Aspidoceratidae The Aspidoceratidae comprise a family of middle and upper Jurassic ammonites that make up part of the superfamily Perisphinctoidea, characterized by evolute shells, commonly stocky, that tend to develop tubercles. The Aspidoceratidae are thought ...
(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 Berriasellinae is a subfamily of very late Jurassic and very early Cretaceous perisphinctoid ammonites in the family Neocomitidae. Berriasellinae comprises generally compressed, evolute genera, typically with furcated ribbing, and in some a smo ...
(derived from Ataxioceratidae)(now considered a subfamily of Neocomitidae) * Polytichitidae Craspeditidae">Craspeditidae.html" ;"title="Craspeditidae">Craspeditidae(derived from Dorsoplanitidae) *Neocomitidae (derived from Berriasellidae)(now placed in the superfamily Endemoceratoidea) *Oosterellidae (Hauterivian derivative of the Neocomitidae)


References

Perisphinctoidea, Ammonitina Prehistoric animal superfamilies Bajocian first appearances Early Cretaceous extinctions {{ammonitina-stub