Protetragonites

Protetragonites is an extinct genus of ammonoid cephalopods belonging to the family Lytoceratidae. These fast-moving nektonic carnivores lived from the Jurassic period Tithonian age to the Cretaceous period Aptian age.

Species

 * Protetragonites crebrisulcatus Uhlig, 1883
 * Protetragonites obliquestrangulatum (Kilian, 1889)
 * Protetragonites quadrisulcatus d'Orbigny, 1841
 * Protetragonites zuegeli Maisch & Salfinger-Maisch, 2016

Description
Shells of Protetragonites species reach a diameter of about 50 mm. Shells show few constrictions and a circular or triangular section.

Distribution
Fossils of species within this genus have been found in the Cretaceous rocks of Austria, Canada, Czech Republic, Slovakia, Dominican Republic, France, Hungary, Madagascar, Morocco, Poland, Spain, Russia, Ukraine, Western Sahara, as well in the Jurassic of Germany, Hungary and Italy.