Alternative spelling: Olcostephanaceae
Parent taxon: Olcostephanina according to Z. Vašíček et al. 2023
Sister taxa: none
Subtaxa: Olcostephanidae
Ecology: fast-moving nektonic carnivore
Distribution:
• Cretaceous of Antarctica (3 collections), Argentina (65), Austria (6), Chile (25), Colombia (9), Czechia (3), Egypt (1), France (256), Georgia (2), Honduras (1), Hungary (26), India (4), Iran (2), Iraq (4), Italy (26), Mexico (38), Morocco (40), Peru (1), Poland (10), Portugal (4), Romania (1), Serbia (4), Slovakia (5), South Africa (2), Spain (63), Switzerland (1), Trinidad and Tobago (1), Tunisia (18), Ukraine (8), United States (19: California, Oregon, Washington), Yemen (11)
• Jurassic to Cretaceous of Chile (1), the Russian Federation (1), Spain (1), United States (1: Oregon)
• Jurassic of Argentina (2), Chile (1), Cuba (1), France (3), Hungary (1), India (7), Iraq (2), Mexico (2), Nepal (1), Peru (1), United States (6: California), Yemen (2)
Total: 692 collections including 936 occurrences