Ptychitaceae

The 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 Ptychitaceae includes three families, the:

• Ptychitidae
• Eosagenitidae
• Sturiidae

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

• Ptychitidae
• Isculitidae
• Nannititdae

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

Fossils of the Ptychitaceae 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.