Parent taxon: Actinocerida according to B. Kröger and M. Aubrechtová 2019
See also Crick 1981, Kröger and Aubrechtova 2017 and Teichert et al. 1964
Sister taxa: Actinoceratidae, Armenoceratidae, Astoceras, Calhounoceras, Carbactinoceratidae, Eldroceras, Georginidae, Gouldoceratidae, Greenlandoceratidae, Hopeioceras, Huroniidae, Jeholoceras, Kobayashiceras, Meitanoceratidae, Ormoceratidae, Parahelenites, Parahelenitidae, Polydesmiidae, Pseudactinoceratidae, Ruedemannoceratidae, Subtofangoceras, Wutinoceratidae, Zerashanoceras
Subtaxa: Gonioceras Hoeloceras Lambeoceras
Ecology: nektobenthic carnivore
Distribution:
• Chazyan of United States (8: New York, Vermont collections)
• Ordovician of Canada (34: Manitoba, Newfoundland and Labrador, Northwest Territories, Nunavut, Ontario, Quebec), Estonia (1), Greenland (1), Norway (4), Sweden (2), United States (56: Colorado, Georgia, Illinois, Iowa, Wisconsin, Indiana, Indiana, Ohio, Iowa, Minnesota, Minnesota, New Mexico, New York, Ohio, South Dakota, Tennessee, Texas, Virginia, Wyoming)
Total: 106 collections including 121 occurrences