Cephalopoda - Actinocerida - Ormoceratidae
Parent taxon: Actinocerida according to B. Kröger and M. Aubrechtova 2017
See also Crick 1981, Frey 1995, Kröger 2008, Sweet 1958 and Teichert et al. 1964
Sister taxa: Actinoceratidae, Armenoceratidae, Astoceras, Calhounoceras, Carbactinoceratidae, Eldroceras, Georginidae, Gonioceratidae, Gouldoceratidae, Greenlandoceratidae, Hopeioceras, Huroniidae, Jeholoceras, Kobayashiceras, Meitanoceratidae, Parahelenites, Parahelenitidae, Polydesmiidae, Pseudactinoceratidae, Ruedemannoceratidae, Subtofangoceras, Wutinoceratidae, Zerashanoceras
Subtaxa: Adamsoceras Deiroceras Metarmenoceras Mstikhinoceras Ormoceras Orthonybyoceras Parormoceras Troedssonoceras
Ecology: nektobenthic carnivore
Distribution:
• Devonian of Canada (1: Quebec collection), Germany (1), Morocco (6), the Russian Federation (1), Ukraine (1), United States (3: New York)
• Silurian of Canada (2: Northwest Territories), Italy (2), the Russian Federation (1)
• Uhaku of the Russian Federation (1)
• Marmor of United States (1: New York)
• Chazyan of United States (1: Maryland)
• Whiterockian of Canada (1: Newfoundland and Labrador), United States (2: Nevada)
• Hunderum of Sweden (1)
• Arenig of China (7)
• Dawan of Mongolia (1)
• Ordovician of Australia (1), Canada (13: Manitoba, Northwest Territories, Nunavut, Ontario, Quebec), China (16), Estonia (8), Malaysia (3), Norway (2), South Korea (3), United States (29: Colorado, Illinois, Iowa, Wisconsin, Indiana, Indiana, Ohio, Kentucky, Minnesota, Ohio, Texas)
Total: 108 collections including 126 occurrences