Artiopoda - Asaphida - Nileidae
Parent taxon: Cyclopygoidea according to J. M. Adrain 2011
See also Fortey and Droser 1999, Harrington and Leanza 1957 and Whittington et al. 1997
Sister taxa: Cyclopygidae, Symphysurinidae, Taihungshaniidae
Subtaxa: Aocaspis Barrandia Berkutaspis Borthaspidella Bumastides Elongatanileus Homalopteon Illaenopsis Kodymaspis Lakaspis Neopsilocephalina Nileidae stenorhachis Nileus Parabarrandia Paraperaspis Peraspis Petrbokia Platypeltoides Poronileus Psilocephalinella Shenjiawania Symphysurus Varvia
Ecology: fast-moving low-level epifaunal carnivore
Distribution:
• Uhaku of Sweden (5 collections)
• Dobrotivian of Czechia (1), Portugal (1), Spain (3)
• Whiterockian of Canada (24: Newfoundland, Newfoundland and Labrador), Norway (4), United States (29: Nevada, Oklahoma, Utah)
• Chazyan of Canada (4: Newfoundland and Labrador)
• Hunderum of Sweden (6)
• Langevoja of Sweden (4)
• Billingen of Norway (1), Sweden (6)
• Arenigian of Canada (2: Northwest Territories), China (16)
• Klabava of Czechia (1), France (1)
• Arenig of Argentina (3), China (22), France (3), Morocco (1), Norway (3), the Russian Federation (1), Sweden (4), the United Kingdom (2)
• Dawan of China (3)
• Ordovician of Argentina (12), Australia (1), Canada (7: Newfoundland, Newfoundland and Labrador, Northwest Territories, Yukon), China (87), Colombia (1), Czechia (5), Estonia (1), France (7), Iran (6), Ireland (9), Kazakhstan (3), Morocco (3), Norway (17), the Russian Federation (23), Spain (1), Sweden (42), the United Kingdom (33), United States (34: Alaska, British Columbia, California, Maine, Nevada, Utah, Virginia)
• Ibexian of United States (3: California, Nevada)
• Cambrian to Ordovician of Argentina (1), Canada (1: Quebec), the Russian Federation (1)
• Cambrian of China (10), the Russian Federation (3)
Total: 461 collections including 564 occurrences