Perisphinctoidea
| Perisphinctoidea Temporal range: Bajocian–Barremian | |
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| Idoceras balderum | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | †Ammonoidea |
| Order: | †Ammonitida |
| Suborder: | †Ammonitina |
| Superfamily: | †Perisphinctoidea Steinmann, 1890 |
| Families | |
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See text | |
| Synonyms | |
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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.[1]
Classification
Some 18 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
- Aspodoceratidae
(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)
(Lower Cretaceous Perisphinctoidea (Berriasan - Hauterivien)
- Polytichitidae [=Craspeditidae] (derived from Dorsoplanitidae)
- Berriasellidae (derived from Ataxioceratidae)
- Neocomitidae(derived from Berriasellidae)
- Oosterellidae (Hauterivian derivative of the Neocomitidae)
References
- 1 2 Arkell, W.J.; Kummel, B.; Wright, C.W. (1957). Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology, Part L, Mollusca 4. Lawrence, Kansas: Geological Society of America and University of Kansas Press.
- ↑ Donovan, Callomon and Howarth 1981 Classification of the Jurassic Ammonitina; Systematics Association.
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