Ptychitoidea, formerly Ptychitacheae, is a superfamily of typically involute, subglobular to discoidal
Ceratitida
Ceratitida is an order that contains almost all ammonoid cephalopod genera from the Triassic as well as ancestral forms from the Upper Permian
The Permian ( ) is a geologic period and stratigraphic system which spans 47 million years from t ...
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
The ''Treatise on Invertebrate Paleontology'' (or ''TIP'') published by the Geological Society of America and the University of Kansas Press, is a definitive multi-authored work of some 50 volumes, written by more than 300 paleontologists, and co ...
'', 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
Ceratitida superfamilies
Middle Triassic first appearances
Late Triassic extinctions
{{Ceratitida-stub