Parent taxon: Actinocerida according to B. A. Stait 1988
See also Chen et al. 1981, Crick 1981, Evans 2005, Stait and Burrett 1984 and Sweet 1958
Sister taxa: Actinoceratidae, Astoceras, Calhounoceras, Carbactinoceratidae, Eldroceras, Georginidae, Gonioceratidae, Gouldoceratidae, Greenlandoceratidae, Hopeioceras, Huroniidae, Jeholoceras, Kobayashiceras, Meitanoceratidae, Ormoceratidae, Parahelenites, Parahelenitidae, Polydesmiidae, Pseudactinoceratidae, Ruedemannoceratidae, Subtofangoceras, Wutinoceratidae, Zerashanoceras
Subtaxa: Armenoceras Kailiceras Megadiscosorus Monocyrtoceras Nybyoceras Selkirkoceras Stolbovoceras
Ecology: nektobenthic carnivore
Distribution:
• Triassic of Greece (1 collection)
• Silurian of Canada (25: Manitoba, Northwest Territories, Ontario, Quebec), China (4), Norway (2), the Russian Federation (14), the United Kingdom (5)
• Uhaku of the Russian Federation (1)
• Whiterockian of Thailand (1)
• Chazyan of United States (3: New York, Vermont)
• Arenig of China (5)
• Dawan of Mongolia (1)
• Ordovician to Silurian of United States (1: California)
• Ordovician of Australia (1), Canada (10: Manitoba, Northwest Territories, Nunavut), China (28), Estonia (1), Malaysia (2), Norway (4), the Russian Federation (2), South Korea (2), United States (11: Illinois, Iowa, Wisconsin, Indiana, Minnesota, New Mexico, Ohio, Texas)
Total: 124 collections including 153 occurrences