Parent taxon: Asaphida according to R. A. Fortey and D. L. Bruton 2013
See also Adrain 2011
Sister taxa: Aethodionide, Anomocarellidae, Anomocaridae, Anomocaroidea, Asaphina, Asaphoidea, Dikelocephaloidea, Eurekiidae, Hungaiidae, Ordosiidae, Parabumasttides, Pseudocyclopyge, Pterocephalidae, Remopleuridae, Rhyssometopidae, Trinucleoidea
Subtaxa: Cyclopygidae Nileidae Symphysurinidae Taihungshaniidae
Type: Cyclopygidae
Ecology: fast-moving low-level epifaunal carnivore
Distribution:
• Uhaku of Sweden (5 collections)
• Dobrotivian of Czechia (2), France (1), Morocco (1), Portugal (1), Spain (3)
• Liben of Czechia (2)
• Letna of Czechia (1)
• Chazyan of Canada (4: Newfoundland and Labrador)
• Whiterockian of Canada (24: Newfoundland, Newfoundland and Labrador), Norway (4), United States (29: Nevada, Oklahoma, Utah)
• Hunderum of Sweden (6)
• Langevoja of Sweden (4)
• Billingen of Norway (1), Sweden (7)
• Arenig of Argentina (3), Bolivia (1), China (65), France (5), Iran (1), Morocco (1), Norway (4), the Russian Federation (1), Spain (1), Sweden (5), the United Kingdom (6)
• Klabava of Czechia (1), France (1)
• Arenigian of Canada (2: Northwest Territories), China (21)
• Dawan of China (4)
• Ordovician of Argentina (12), Australia (2), Canada (62: Alberta, British Columbia, Newfoundland, Newfoundland and Labrador, Northwest Territories, Quebec, Yukon), China (156), Colombia (1), Czechia (17), Estonia (1), France (12), Greenland (4), Iran (12), Ireland (10), Italy (3), Kazakhstan (8), Morocco (3), Norway (19), Oman (1), the Russian Federation (23), Spain (1), Sweden (46), the United Kingdom (50), United States (66: Alaska, British Columbia, California, Idaho, Maine, Montana, Nevada, New Mexico, New York, Oklahoma, Texas, Utah, Vermont, Virginia)
• Skullrockian of Canada (22: British Columbia, Newfoundland), Greenland (1), United States (25: New York, Texas, Utah)
• Ibexian of United States (3: California, Nevada)
• Cambrian to Ordovician of Argentina (1), Canada (1: Quebec), the Russian Federation (1)
• Cambrian of Canada (4: Newfoundland and Labrador), China (10), the Russian Federation (3), United States (10: Texas, Utah)
Total: 807 collections including 1156 occurrences