Pachydesmoceras is a genus of ammonites belonging to the family Desmoceratidae.
Species of this genus were fast-moving nektonic carnivorous shelled cephalopods. They lived during the Cretaceous, from the Albian (112.0-99.6 Mya) to the Santonian (85.8-83.5 Mya) stage.
Distribution Cretaceous of Antarctica, Cameroon, India, Japan, Nigeria, Romania, United States (California).
See also Cephalopod size
References
Sepkoski, Jack Sepkoski's Online Genus Database – Cephalopodes Paleobiology Database Adrian Kin First record of the puzosiine ammonite genus Pachydesmoceras from the Middle and Upper Turonian of Poland Tatsuro Matsumoto Note on Pachydesmoceras, a Cretaceous ammonite genus