Heteroceras Explained

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.

Further reading

• Web site: Heteroceras . mindat.org . 16 June 2022.
• Book: [[Claud William Wright| Wright]], Claud William; with John Hannes Callomon and M.K. Howarth . 1996 . Mollusca 4 Revised, Cretaceous Ammonoidea in Treatise on Invertebrate Paleontology Part L . Roger L. Kaesler . The Geological Society of America & University of Kansas Press. Boulder, Colorado and Lawrence, Kansas . registration . 227.
• Book: . Furnish, W. M. . Kummel, Bernhard . Miller, A.K. . Moore, R.C. . Schindewolf, O.H. . 1957 . Part L, Mollusca 4: Cephalopoda, Ammonoidea . Treatise on Invertebrate Paleontology . Geological Society of America and University of Kansas Press . Raymond C. Moore . Raymond Cecil Moore . registration . L212 . 978-0-8137-3012-7 . Internet Archive.

• For illustrations see Genre Heteroceras, Orbigny 1850

Notes and References

1. with and (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.
2. Web site: Heteroceras. Fossilworks. 15 June 2022.