title: Progeronia
text: # 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 millimetres (0.24–0.91 in). 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.
  
  