Trilobita - Phacopida - Cheiruridae
Parent taxon: Cheiruridae according to I. W. Gapp et al. 2012
See also Kielan-Jaworowska et al. 1991 and Owen 1981
Sister taxa: Acanthoparyphinae, Actinopeltis, Anasobella, Ancyginaspis, Arcticeraurinella, Areia, Areiaspis, Borealaspis, Bornholmaspis, Ceraurinium, Cerauromeros, Cerauropeltis, Ceraurus, Chacomurus, Cheirurinae, Cheirurus, Chiozoon, Contracheirurus, Crotalocephalides, Crotalocephalina, Crotalocephalus, Cyrtometopinae, Cyrtometopus, Deiphon, Deiphoninae, Didrepanon, Eccoptochilinae, Forteyops, Foulonia, Gabriceraurus, Hammannopyge, Hapsiceraurus, Heliomera, Heliomeroides, Hemisphaerocoryphe, Holia, Holotrachelus, Hyrokybe, Junggarella, Kawina, Kolymella, Krattaspis, Ktenoura, Laneites, Lehua, Onycopyge, Osekaspis, Parayoungia, Parisoceraurus, Pateraspis, Patomaspis, Pilekiinae, Placoparina, Pompeckia, Proromma, Protocerauroides, Pseudocheirurus, Radiurus, Ratinkaspis, Reraspis, Sphaexerochinae, Stubblefieldia, Sycophantia, Turantyx, Valongia, Whittakerites, Xylabion, Xystocrania, Youngia, Zazvorkaspis, Kinderlania
Subtaxa: Pseudosphaerexochus Sphaerexochus
Ecology: fast-moving low-level epifaunal carnivore
Distribution:
• Whitwellian of Canada (4: Northwest Territories collections)
• Niagaran of United States (1: Indiana)
• Silurian of Australia (5), Canada (16: Northwest Territories, Nunavut, Quebec), the Czech Republic (12), Greenland (3), Japan (2), Sweden (15), Ukraine (3), United States (17: Arkansas, Illinois, Indiana, Oklahoma, Wisconsin), Uzbekistan (2)
• Dobrotivian of France (1)
• Uhaku of Estonia (1)
• Chazyan of Canada (15: Northwest Territories, Quebec), United States (13: New York)
• Whiterockian of Canada (7: Quebec), United States (19: New York, Oklahoma, Vermont)
• Arenig of China (1), Sweden (1)
• Ordovician of Australia (1), Belgium (1), Canada (13: Newfoundland, Northwest Territories, Quebec), China (17), the Czech Republic (1), Estonia (3), France (2), Iran (1), Ireland (6), Kazakhstan (5), the Netherlands (1), Norway (19), Portugal (1), the Russian Federation (2), Spain (4), Sweden (28), the United Kingdom (28), United States (18: Maine, Virginia)
Total: 289 collections including 310 occurrences