Olcostephanidae

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

 * Bihenduloceras
 * Olcostephanus Neumayr, 1875
 * Saynoceras
 * Subastieria Spath, 1923
 * Taraisites Canta-Chapa, 1966
 * Valanginites Sayn, 1910

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.