Perisphinctaceae
| 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 |
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| Synonyms | |
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See text
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.
Some 18 families have been recognized in the Perisphinctoidea. The following is based on Donovan et al. 1981 with modification from the Treatise on Invertebrate Paleontology, Part L (1957)
(Middle Jurassic direct derivatives of the Perisphinctidae)
(early Upper Jurassic (Oxfordian) derivatives of Perisphinctidae)
(mid Upper Jurassic (Kimmeridgian) derivatives of the Ataxioceratidae)
(late Upper Jurassic (Tithonian) derivatives of Perisphinctidae)
(Lower Cretaceous Perisphinctoidea (Berriasan - Hauterivien)
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