Progeronia

Progeronia is a genus of ammonites belonging to the family Perisphinctidae.

These fast-moving nektonic carnivores lived in the Jurassic period, from 155.7 to 150.8 Ma.

Species
Species within this genus include:
 * Progeronia breviceps
 * Progeronia lictor
 * Progeronia polyplocoides

Description
Shells of Progeronia species can reach a diameter of 6 - 23 mm. These large shell are large and involute, with a bifurcated or trifurcated ribs.

Distribution
Fossils of species within this genus have been found in the Jurassic sediments of Algeria and Hungary.