Heteroceras Temporal range: Barremian–Aptian PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	† Ammonoidea
Order:	† Ammonitida
Suborder:	† Ancyloceratina
Family:	† Heteroceratidae
Genus:	† Heteroceras d'Orbigny, 1849

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

Further reading

• "Heteroceras". mindat.org. Retrieved 16 June 2022.
• Wright, Claud William; with John Hannes Callomon and M.K. Howarth (1996). Roger L. Kaesler (ed.). Mollusca 4 Revised, Cretaceous Ammonoidea in Treatise on Invertebrate Paleontology Part L. Boulder, Colorado and Lawrence, Kansas: The Geological Society of America & University of Kansas Press. p.  227.{{ cite book}}: CS1 maint: multiple names: authors list ( link)
• Arkell, W. J.; Furnish, W. M.; Kummel, Bernhard; Miller, A.K.; Moore, R.C.; Schindewolf, O.H. (1957). "Part L, Mollusca 4: Cephalopoda, Ammonoidea". In Raymond C. Moore (ed.). Treatise on Invertebrate Paleontology. Geological Society of America and University of Kansas Press. p.  L212. ISBN  978-0-8137-3012-7 – via Internet Archive.

• For illustrations see Genre Heteroceras, Orbigny 1850

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