''Protrachyceras'' is a genus of ceratitid

ammonoid Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living coleoids (i.e., octopuses, squid and cuttlefi ...

cephalopods belonging to the family

Trachyceratidae The Trachyceratidae is an extinct family of ceratitid ammonoid cephalopods. The Trachyceratidae makes up part of the superfamily Trachyceratoidea along with such families as the Buchitidae, Distichitidae, Dronovitidae and Noridiscitidae. ...

Species

*''Protrachyceras costulatum'' Mansuy 1912 *''Protrachyceras deprati'' Mansuy 1912 *''Protrachyceras reitzi'' Boeckh 1875 *''Protrachyceras sikanianum'' McLearn 1930 *''Protrachyceras springeri'' Smith 1914 *''Protrachyceras storrsi'' Smith 1927 was rearranged to Sirenites storrsi (SMITH ) by Tozer 1968

Fossil record

Fossils of ''Protrachyceras'' are found in marine strata from 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 ...

(age range: from 242.0 to 221.5 million years ago.). Fossils are known from many localities in Afghanistan, Canada, China, India, Italy, Japan, Romania, the Russian Federation, Slovenia, Spain, Switzerland, Thailand and United States.The Paleobiology Database
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Gallery

File:Trachyceratidae - Protrachyceras psaeudoarchelonus.JPG, ''Protrachyceras psaeudoarchelonus'' File:Protrachyceras margaritosum.jpg, ''Protrachyceras margaritosum'' File:Protrachyceras rudolphi.jpg, ''Protrachyceras rudolphi'' File:Museo delle Grigne - EL222 - Trachyceras (Protrachyceras) longobardicum cf.jpg, ''Protrachyceras longobardicum''

Bibliography

* Arkell et al. Mesozoic Ammonoidea.

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. 1957 * Bernhard Kummel 1952. A Classification of Triassic Ammonoids. Jour of Paleontology, Vol 26, No.5, pp 847–853

References

Trachyceratidae Ceratitida genera Triassic ammonites of Europe Triassic ammonites of North America {{Ceratitida-stub