Heteroceras
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Heteroceras is a genus of Lower Cretaceous heteromorph ammonites belonging to the ancyloceratoidean family, Heteroceratidae.[1]
Description
It is characterized by a helically coiled juvenile shell at the apex followed by slightly curved adult shaft, with a J-shaped section at the end of it. The shell is ribbed; ribs are concave and oblique on the helix, straight and transverse on the later stages.
Distribution
Heteroceras has been found in Argentina, Bulgaria, Colombia (La Guajira), the Czech Republic, France, Italy, Japan, Madagascar, Serbia and Montenegro, South Africa, Spain, Russia and the United States (Kansas, Wyoming).[2] Related genera are Hemibaculites and Cochidites. The family, Heteroceratidae, is a derivative of the Ancyloceratidae.
References
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- ↑ <templatestyles src="smallcaps/styles.css"/>Wright, C. W. with <templatestyles src="smallcaps/styles.css"/>Callomon, J.H. and <templatestyles src="smallcaps/styles.css"/>Howarth, M.K. (1996), Mollusca 4 Revised , Cretaceous Ammonoidea, vol. 4, in Treatise on Invertebrate Paleontology, Part L (Roger L. Kaesler ed.), Boulder, Colorado: The Geological Society of America & Lawrence, Kansas: University of Kansas Press, p. 227.
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Further reading
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- For illustrations see Genre Heteroceras, Orbigny 1850
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- Cretaceous ammonites
- Ammonites of South America
- Cretaceous Africa
- Cretaceous Argentina
- Cretaceous Asia
- Cretaceous Colombia
- Cretaceous Europe
- Cretaceous North America
- Fossils of Japan
- Cretaceous France
- Fossils of France
- Cretaceous Italy
- Fossils of Italy
- Fossils of the United States
- Fossils of Colombia
- Cretaceous Spain
- Fossils of Spain
- Ancyloceratoidea
- Ammonite genera