Trilobita - Phacopida - Cheiruridae
Full reference: H. B. Whittington and W.R., I.I. Evitt. 1953. Silicified Middle Ordovician trilobites. Geological Society of America Memoir 59:1-139
Parent taxon: Cheiruridae according to J. M. Adrain 1998
See also Edgecombe et al. 1999, Nikolaisen 1961 and Owen 1981
Sister taxa: Actinopeltis, Anasobella, Ancyginaspis, Arcticeraurinella, Areia, Areiaspis, Borealaspis, Bornholmaspis, Ceraurinium, Cerauromeros, Cerauropeltis, Ceraurus, Chacomurus, Cheirurinae, Cheirurus, Chiozoon, Contracheirurus, Crotalocephalides, 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, Sphaerexochinae, Sphaexerochinae, Stubblefieldia, Sycophantia, Turantyx, Valongia, Whittakerites, Xylabion, Xystocrania, Youngia, Zazvorkaspis, Kinderlania
Subtaxa: Acanthoparypha Nieszkowskia Pandaspinapyga
Ecology: fast-moving low-level epifaunal carnivore
Distribution:
• Whiterockian of Canada (3: Northwest Territories, Quebec collections), United States (4: New York)
• Chazyan of Canada (14: Northwest Territories, Quebec), United States (1: New York)
• Volkhov of the Russian Federation (6)
• Ordovician of Argentina (17), Canada (10: Northwest Territories), Estonia (2), Ireland (1), Kazakhstan (1), the Netherlands (1), Norway (5), the Russian Federation (3), Sweden (7), the United Kingdom (3), United States (17: Illinois, Illinois, Iowa, Minnesota, Missouri, Oklahoma, Utah, Virginia)
Total: 95 collections including 107 occurrences