Perisphinctoidea
Extinct superfamily of ammonites
From Wikipedia, the free encyclopedia
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.[1]
| Perisphinctoidea Temporal range: | |
|---|---|
| |
| Idoceras balderum | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | †Ammonoidea |
| Order: | †Ammonitida |
| Suborder: | †Ammonitina |
| Superfamily: | †Perisphinctoidea Steinmann, 1890 |
| Families | |
|
See text | |
| Synonyms | |
| |
Classification
Some 16 families have been recognized in the Perisphinctoidea. The following is based on Donovan et al. 1981[2] with modification from the Treatise on Invertebrate Paleontology, Part L (1957)[1]
- Perisphinctidae: Middle and Upper Jurassic root stock, derived from the Stephanoceratidae
(Middle Jurassic direct derivatives of the Perisphinctidae)
- Morphiceratidae
- Tulitidae
- Reineckeiidae
- Pachyceratidae
- Aspidoceratidae
(early Upper Jurassic (Oxfordian) derivatives of Perisphinctidae)
(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)
