Trachyceratidae

Trachyceratidae Temporal range: Devonian - Triassic PreꞒ Ꞓ O S D C P T J K Pg N
Fossil of Protrachyceras psaeudoarchelonus
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	†Ammonoidea
Order:	†Ceratitida
Superfamily:	†Clydonitoidea
Family:	†Trachyceratidae Haug,1894

The Trachyceratidae is an extinct family of ceratitid ammonoid cephalopods.

The Trachyceratidae makes up part of the superfamily Clydonitaceae along with such families as the and . 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
• Konstantinov 2012
• Urlichs 1994
• Tomlin 1931
• Krystyn 1978
• Konstantinov 2012
• Protrachyceras Mojsisovics 1893
• 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, Ukraine 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

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