Phyllopachyceras Explained

Phyllopachyceras is an extinct genus of ammonoid cephalopods belonging to the family Phylloceratidae. These nektonic carnivores lived in the Cretaceous, from Hauterivian to Maastrichtian to age.^[1]

Species

• Phyllopachyceras chitianum Imlay, 1960
• Phyllopachyceras infundibulum d'Orbigny, 1841
• Phyllopachyceras reymenti Riccardi, 2018
• Phyllopachyceras trinitense Anderson, 1938
• Phyllopachyceras umpuanum Anderson, 1938

Description

Shells of Phyllopachyceras can reach a diameter of about . On the external surface ribs are alternately short and long and sutures show a high complexity, with saddle endings perfectly quadruple (tetraphillic). The section of the shell is quite thick.^[2]

Distribution

Fossils of species within this genus have been found in the Cretaceous of Antarctica, Argentina, Austria, China, France, Hungary, Italy, Japan, Madagascar, New Zealand, Poland, Russia, Spain, Ukraine and United States.

Further reading

• Kazushige Tanabe, Cyprian Kulicki, and Neil H. Landman Precursory siphuncular membranes in the body chamber of Phyllopachyceras and comparisons with other ammonoids

Notes and References

1. Sepkoski, Jack Sepkoski's Online Genus Database – Cephalopoda
2. Web site: Phyllopachyceras ezoense. Ammonites. https://web.archive.org/web/20191113234729/http://www.ammonites.fr/Fiches/0269.htm. November 13, 2019. dead.