Parkinsonia (ammonite)

Parkinsonia is a genus of ammonites belonging to the family Parkinsoniidae.

These fast-moving nektonic carnivores lived from the Bajocian age to the Bathonian age of the Middle Jurassic.

Description
Parkinsonia species have a compressed spiral shell with strong ribbing.

Distribution
Fossils of species within this genus have been found in the Jurassic of France, Germany, Iran, Russia, United Kingdom, and United States.