# Ptychites

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***Ptychites*** is an extinct genus of cephalopods belonging to the family [Ptychitidae](/source/Ptychitidae). These nektonic carnivores lived during the [Triassic](/source/Triassic) period, from [Anisian](/source/Anisian) to [Ladinian](/source/Ladinian) age.[1]

## 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.[2]

## Distribution

Fossils of species within this genus have been found in the [Triassic](/source/Triassic) of Afghanistan, Austria, Canada, China, Hungary, Italy, Japan, Malaysia, Oman, Papua New Guinea, Russia, Tunisia, Turkey, United States.[3]

## References

1. Sepkoski, Jack [Sepkoski's Online Genus Database – Cephalopoda](http://strata.geology.wisc.edu/jack/showgenera.php?taxon=231&rank=class)

1. [TRIASSIC CEPHALOPOD GENERA OF AMERICA, pg. 86 - Professional Paper - United States Geological Survey](https://books.google.com/books?id=QEIRAAAAIAAJ&dq=Ptychites&pg=RA1-PA86)

1. [The Paleobiology Database](https://www.fossilworks.org)

- [Mikko's Phylogeny Archive](http://www.helsinki.fi/~mhaaramo/metazoa/protostoma/mollusca/cephalopoda/ammonoidea/ceratitida.html)

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