Trachyceratidae
The Trachyceratidae is an extinct family of ceratitid ammonoid cephalopods.
| Trachyceratidae | |
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| Fossil of Protrachyceras psaeudoarchelonus | |
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| Family: | Trachyceratidae Haug,1894 |
The Trachyceratidae makes up part of the superfamily Clydonitaceae along with such families as the Clydonitidae and Arpaditidae. The Clydonitaceae is also known by the junior synonym Trachycerataceae.
Description
Trachyceratid shells are more or less involute and highly ornamented. They have their whorl sides covered with flexious ribs that are usually tuberculate. The venters generally have a median furrow bordered by rows of tubercles or continuous keels.
Selected genera
- Austrotrachyceras Krystyn 1978
- Boreotrachyceras Konstantinov 2012
- Brotheotrachyceras Urlichs 1994
- Hannaoceras Tomlin 1931
- Neoprotrachyceras Krystyn 1978
- Okhototrachyceras Konstantinov 2012
- Protrachyceras Mojsisovics 1893
- Trachyceras Laube 1869
Fossil record
Fossils of Trachyceratidae are found in marine strata from the Devonianto the Triassic (age range: from : 409.1 to 212.0 million years ago.). Fossils are known from many localities in Afghanistan, Canada, China, Europe, India, Japan, the Russian Federation, Slovenia, Spain, Switzerland, Thailand, Ikraine and United States. [1]
References
- Arkell et al. Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology, Part L. 1957
- Bernhard Kummel 1952. A Classification of Triassic Ammonoids. Jour of Paleontology, Vol 26, No.5, pp 847–853, Sept 1952