''Ptychites'' is an extinct genus of cephalopods belonging to the family

Ptychitidae The Ptychitidae is a family of ceratitid ammonites (''ammonites sensu lato''). They are combined with the Eosagenitidae and Sturiidae in the superfamily Ptychitoidea Ptychitoidea, formerly Ptychitacheae, is a superfamily of typically involute ...

. These nektonic carnivores lived during the

Triassic The Triassic ( ) is a geologic period and system which spans 50.6 million years from the end of the Permian Period 251.902 million years ago ( Mya), to the beginning of the Jurassic Period 201.36 Mya. The Triassic is the first and shortest period ...

period, from

Anisian In the geologic timescale, the Anisian is the lower stage or earliest age of the Middle Triassic series or epoch and lasted from million years ago until million years ago. The Anisian Age succeeds the Olenekian Age (part of the Lower Triassic Ep ...

Ladinian The Ladinian is a stage and age in the Middle Triassic series or epoch. It spans the time between Ma and ~237 Ma (million years ago). The Ladinian was preceded by the Anisian and succeeded by the Carnian (part of the Upper or Late Triassic). ...

age.

Species

* ''Ptychites besnosovi'' Shevyrev 1995 * ''Ptychites densistriatus'' Bucher 1992 * ''Ptychites domatus'' Silberling and Tozer 1968 * ''Ptychites evansi'' Smith 1914 * ''Ptychites gradinarui'' Bucher 1992 * ''Ptychites guloensis'' Tozer 1994 * ''Ptychites hamatus'' Tozer 1994 * ''Ptychites miyagiensis'' Bando 1964 * ''Ptychites nipponicus'' Bando 1964 * ''Ptychites oppeli'' Mojsisovic 1882 * ''Ptychites opulentus'' Mojsisovics 1882 * ''Ptychites pseudoeuglyphus'' Konstantinov 1991 * ''Ptychites stachei'' Mojsisovics 1882 * ''Ptychites trochleaeformis'' Lindstroem 1865 * ''Ptychites wrighti'' McLearn 1946

Description

Species in this genus are quite variable in form, ranging from subglobose to laterally compressed. The surface of the shell is sculptured with low folds.

Distribution

Fossils of species within this genus have been found in the

of Afghanistan, Austria, Canada, China, Hungary, Italy, Japan, Malaysia, Oman, Papua New Guinea, Russia, Tunisia, Turkey, United States.The Paleobiology Database
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References

Ptychitaceae Triassic ammonites Ceratitida genera Ammonites of Europe Ammonites of North America Anisian life Anisian genus first appearances Ladinian genus extinctions {{Ceratitida-stub