†order Cyrtocerinida Mutvei 2015 (mollusk)
Parent taxon: Multiceratoidea according to A. Pohle et al. 2022
See also King and Evans 2019
Sister taxa: Apocrinoceratidae, Apsidoceratidae, Ascocerida, Bassleroceratidae, Clinoceratidae, Cyclostomiceratidae, Discosorida, Oncocerida, Tarphycerida, Uranoceratidae
Subtaxa: Cyrtocerinidae
Ecology: fast-moving nektonic carnivore
Distribution:
• Ordovician of Australia (2 collections), Canada (3: Northwest Territories, Ontario), Estonia (2), United States (25: Illinois, Iowa, Wisconsin, Indiana, Minnesota, Missouri, Ohio, Wisconsin)
Total: 32 collections including 38 occurrences