Olcostephanus
Olcostephanus is an extinct ammonoid cephalopod genus belonging to the family Olcostephanidae. These fast-moving nektonic carnivores lived during the Cretaceous, from the upper Valanginian to the lower Hauterivian age.
Species
Source:Olcostephanus astierianus Olcostephanus atherstoni Sharpe, 1856Olcostephanus bakeri Imlay, 1937Olcostephanus bosei Riedel, 1938Olcostephanus delicatecostatus Haas, 1960Olcostephanus detonii Rodighiero 1919Olcostephanus filifer Imlay, 1937Olcostephanus laticosta Gerth, 1925Olcostephanus paucicostatus Imlay, 1937Olcostephanus pecki Imlay, 1960Olcostephanus popenoei Imlay, 1960Olcostephanus prorsiradiatus Imlay, 1937Olcostephanus quadriradiatus Imlay, 1938Olcostephanus sanlazarensis Imlay, 1937
Distribution
Fossils of species within this genus have been found in the Cretaceous sediments of Antarctica, Argentina, Austria, Bulgaria, Chile, Colombia, Czech Republic, France, Hungary, Italy, Mexico, Morocco, Poland, Portugal, Romania, Slovakia, South Africa, Spain, Russia, United States, as well as in the Jurassic of Argentina.