Lyelliceras

Lyelliceras is a genus of ammonites belonging to the family Lyelliceratidae. These cephalopods were fast-moving nektonic carnivores. They lived in the Cretaceous period, Albian stage (109.0 to 99.7 Ma).
Etymology.
The genus has been named after geologist Charles Lyell.
Description.
Shells of "Lyelliceras" species can reach a diameter of about . They are moderately to very evolute. The section of the whorls is slightly compressed or circular, with straight radial ribs.
Species.
The following species have been recognised:
Distribution.
Fossils of species within this genus have been found in the Cretaceous sediments of Colombia (Hiló Formation, Tolima), France, Madagascar, Mexico, Peru, South Africa, United Kingdom, United States and Venezuela.