Ptychitoidea

Ptychitoidea Temporal range:
fossil of ptychites studeri
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	†Ammonoidea
Order:	†Ceratitida
Superfamily:	†Ptychitoidea Tozer, 1994
Families
See text
Synonyms
Ptychitaceae

Ptychitoidea, formerly Ptychitacheae, is a superfamily of typically involute, subglobular to discoidal Ceratitida in which the shell is smooth with lateral folds or striations, inner whorls are globose, and the suture is commonly ammonitic. Their range is Middle_ and Upper Triassic.

In its present configuration the Ptychitoidea includes three families, the:

• Ptychitidae
• Eosagenitidae
• Sturiidae

This differs from the taxonomy in the Treatise on Invertebrate Paleontology, Part L, in which the Ptychitoidea included the

• Ptychitidae
• Isculitidae
• Nannititdae

The Isculitidae have since been removed to the Pinacocerataceae and the Nannitidae to the Danubitaceae.

Fossils of Ptychitoidea have been found in the Triassic of California and Nevada in the United States; British Columbia and Nunavut in Canada; Italy, Switzerland, and Hungary in Europe; Russia, China, and Afghanistan in Eurasia; Tunisia, Oman, Malaysia, and Papua New Guinea.

References

• Treatise on Invertebrate Paleontology, Part L, Ammonoidea. R. C. Moore (ed). Geological Society of America and Univ of Kansas press, 1957
• superfamily Ptychitaceae Mojsisovics 1882 Paleobiology DB