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.
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 (d'Orbigny, 1840) Olcostephanus atherstoni Sharpe, 1856 Olcostephanus bakeri Imlay, 1937 Olcostephanus bosei Riedel, 1938 Olcostephanus delicatecostatus Haas, 1960 Olcostephanus detonii Rodighiero 1919 Olcostephanus filifer Imlay, 1937 Olcostephanus laticosta Gerth, 1925 Olcostephanus paucicostatus Imlay, 1937 Olcostephanus pecki Imlay, 1960 Olcostephanus popenoei Imlay, 1960 Olcostephanus prorsiradiatus Imlay, 1937 Olcostephanus quadriradiatus Imlay, 1938 Olcostephanus sanlazarensis Imlay, 1937
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).