Phyllopachyceras
| Phyllopachyceras Temporal range: Cretaceous, 145.5–70.6 Ma | |
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| Fossil shells of Phyllopachyceras infundibulum from Alpes-de-Haute-Provence, on display at Galerie de paléontologie et d'anatomie comparée in Paris | |
| Scientific classification | |
| Class: | Cephalopoda |
| Subclass: | Ammonoidea |
| Order: | Ammonitida |
| Family: | Phylloceratidae |
| Subfamily: | Phylloceratinae |
| Genus: | Phyllopachyceras Spath, 1925 |
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.[2]
Species
- Phyllopachyceras chitianum Imlay 1960
- Phyllopachyceras infundibulum d'Orbigny 1841
- Phyllopachyceras trinitense Anderson 1938
- Phyllopachyceras umpuanum Anderson 1938
Description
Shells of Phyllopachyceras can reach a diameter of about 4.5 centimetres (1.8 in). 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.[3]
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
- Kazushige Tanabe, Cyprian Kulicki, and Neil H. Landman Precursory siphuncular membranes in the body chamber of Phyllopachyceras and comparisons with other ammonoids
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