Olcostephanidae is an extinct ammonoid cephalopod family belonging to the superfamily Perisphinctoidea. These fast-moving nektonic carnivores lived from the Jurassic to the Cretaceous period.
Genera Source:
Aspidostephanus Baronnites Cantianiceras Capeloites Ceratotuberculus Garcites Groebericeras Holcostephanus Kilianiceras Mexicanoceras Negreliceras Olcostephanus Parastieria Proniceras Santafecites Saynoceras Simospiticeras Spiticeras (=Bihenduloceras) Umiaites Valanginites
Distribution Fossils of species within this genus have been found in the Cretaceous sediments of Antarctica, Argentina, Austria, Chile, Colombia, Czech Republic, Czechoslovakia, France, Hungary, Italy, Mexico, Morocco, Peru, Poland, Portugal, Romania, Slovakia, South Africa, Spain, Russia, United States, as well as in the Jurassic of Argentina and Mexico.
References