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.Sepkoski, Jack Sepkoski's Online Genus Database – Cephalopoda
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.
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.
References
Further reading Kazushige Tanabe, Cyprian Kulicki, and Neil H. Landman Precursory siphuncular membranes in the body chamber of Phyllopachyceras and comparisons with other ammonoids