The Trachyceratidae is an extinct family 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 cuttlefish) ...

cephalopods. The Trachyceratidae makes up part of the superfamily Trachyceratoidea along with such families as the Buchitidae, Distichitidae, Dronovitidae and Noridiscitidae. The Trachyceratoidea is also known by the junior synonym Trachycerataceae.

Fossil record

Fossils of ''Trachyceratidae'' are found in marine strata from the

Devonian The Devonian ( ) is a geologic period and system of the Paleozoic era, spanning 60.3 million years from the end of the Silurian, million years ago (Mya), to the beginning of the Carboniferous, Mya. It is named after Devon, England, whe ...

to 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 ...

. Fossils are known from many localities in

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(

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, the

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, and the

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Description

Trachyceratid shells are more or less involute and highly ornamented. They have their whorl sides covered with flexuous ribs that are usually tuberculate. The venters generally have a median furrow bordered by rows of tubercles or continuous keels.

Classification

Trachyceratidae *'' Boreotrachyceras'' Konstantinov 2012 *'' Brotheotrachyceras'' Urlichs 1994 *'' Hannaoceras'' Tomlin 1931 *'' Okhototrachyceras'' Konstantinov 2012 *Trachyceratinae Haug 1894 **'' Austrotrachyceras'' Krystyn 1978 **'' Muensterites'' Mojsisovics 1893 **''

Trachyceras ''Trachyceras'' is a genus belonging to the extinct subclass of cephalopods known as ammonites. Specifically it belongs in the order Ceratitida Ceratitida is an order that contains almost all ammonoid cephalopod genera from the Triassic as we ...

'' Laube 1869 **'' Neoprotrachyceras'' Krystyn 1978 *Arpaditinae Hyatt 1900 **'' Arctoarpadites'' Tozer 1994E. T. Tozer. 1994. Canadian Triassic Ammonoid Faunas. Geological Survey of Canada Bulletin 467:1-663. ISBN 0-660-15368-8 **'' Arctosirenites'' Tozer 1961 **'' Argolites'' Renz 1939 **'' Arpadites'' Mojsisovics 1879 **'' Dittmarites'' Mojsisovics 1893 **'' Edmundites'' Diener 1916 **'' Hisnitites'' Tozer 1994 **'' Klipsteinia'' von Mojsisovics 1882 **'' Liardites'' Tozer 1963 **'' Meginoceras'' McLearn 1930M. Gómez-Luna, E. Cedillo-Pardo, B. Contreras Montero, I. Gallo-Padilla, and A. Martínez-Cortés. 1998. Un nuevo perfil del Ladiniano-Cárnico Inferior con fauna de amonoideos en La Ballena, Zacatecas, México. Revista Mexicana de Ciencias Geológicas 15(1):38-45 **'' Otoarpadites'' Tozer 1994 **'' Silenticeras'' McLearn 1930 **'' Trachystenoceras'' Johnston 1941 **'' Yakutosirenites'' Tozer 1994 *Sirenitinae Tozer 1971 **'' Anasirenites'' Mojsisovics 1893 **'' Diplosirenites'' Mojsisovics 1893 **'' Neosirenites'' Popov 1961 **'' Norosirenites'' Tozer 1994 **'' Orientosirenites'' Konstantinov 2018 **'' Pamphagosirenites'' Popov 1961 **'' Pseudosirenites'' Arthaber 1911 **'' Pterosirenites'' Tozer 1980 **'' Seimkanites'' Konstantinov 1999 **'' Sirenites'' Mojsisovics 1893S. Lukeneder and A. Lukeneder. 2014. A new ammonoid fauna from the Carnian (Upper Triassic) Kasimlar Formation of the Taurus Mountains (Anatolia, Turkey). Palaeontology 57:357-396 **'' Sirenotrachyceras'' Krystyn 1978 **'' Striatosirenites'' Popov 1961 **'' Vredenburgites'' Diener 1916 *Protrachyceratinae Tozer 1971 **'' Eoprotrachyceras'' Tozer 1980 **'' Paratrachyceras'' Arthaber 1915 **''

Protrachyceras ''Protrachyceras'' is a genus of ceratitid ammonoid cephalopods belonging to the family Trachyceratidae. Species *''Protrachyceras costulatum'' Mansuy 1912 *''Protrachyceras deprati'' Mansuy 1912 *''Protrachyceras reitzi'' Boeckh 1875 *''Protrac ...

'' Mojsisovics 1893 **'' Spirogmoceras'' Silberling 1956 *Anolcitinae Mietto and Manfrin 2008 **'' Anolcites'' Mojsisovics 1893P. Mietto and S. Manfrin. 2008
Selected ammonoid fauna from Prati Di Stuores/Stuores Wiesen and related sections across the Ladinian-Carnian boundary (southern Alps, Italy)
Rivista Italiana di Paleontologia e Stratigrafia 114:377-429 **'' Asklepioceras'' Renz 1910 **''

Daxatina ''Daxatina'' is a fossil ammonoid cephalopod included in the trachyceratid family of the order Ceratitida Ceratitida is an order that contains almost all ammonoid cephalopod genera from the Triassic as well as ancestral forms from the Upper ...

'' Strand 1929 **'' Falsanolcites'' Rieber and Brack 2004 **'' Frankites'' Tozer 1971 **'' Maclearnoceras'' Tozer 1963 **'' Zestoceras'' Tozer 1994 *Haoceratinae Balini and Zou 2015 **'' Haoceras'' Balini and Zou 2015M. Balini and X. D. Zou. 2015
Ammonoids from the Zhuganpo Member of the Falang Formation at Nimaigu and their relevance for dating the Xingyi fossil-Lagerstätte (late Ladinian, Guizhou, China)
Rivista Italiana di Paleontologia e Stratigrafia 121:135-161 **'' Sinomeginoceras'' Balini and Zou 2015

Gallery

File:Trachyceras fossil at NMMNHS.jpg, '' Trachyceras sp.'' at the

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File:Museo delle Grigne - EL88 - Arpadites (Arpadites) szaboi.jpg, '' Arpadites szaboi'' File:Museo delle Grigne - EL96A - Arpadites (Arpadites) arpadis.jpg, '' Arpadites arpadis'' File:Museo delle Grigne - EL66 - Arpadites telleri.jpg, '' Arpadites telleri'' File:Trachyceratidae - Protrachyceras psaeudoarchelonus.JPG, '' Protrachyceras psaeudoarchelonus'' File:Protrachyceras archelaus.JPG, ''Protrachyceras archelaus'' File:Anolcites doleriticus.jpg, '' Anolcites doleriticus'' File:Asklepioceras sp Ladinico Val Badia.JPG, '' Asklepioceras sp.'' at Museo di Storia naturale "Antonio Stoppani" File:Protrachyceras gortanii Rasa.JPG, '' Falsanolcites gortanii'' (also known as ''Protrachyceras gortanii'')

Fossil record

Description

Classification

Gallery

References

Further reading