Trilobita - Phacopida - Pterygometopidae
Parent taxon: Pterygometopidae according to V. Jaanusson and L. Ramsköld 1993
See also Owen 1981, Owen and Bruton 1980 and Warburg 1925
Sister taxa: Calliops, Chasmopinae, Creatarginae, Eomonorachinae, Monorakinae, Truncatometopus, Volkops, Yankaoia
Subtaxa: Achatella Estoniops Ingriops Isalaux Keilapyge Oelandiops Pterygometopus Upplandiops Yanhaoia
Ecology: fast-moving low-level epifaunal carnivore
Distribution:
• Dobrotivian of Portugal (1 collection)
• Uhaku of Estonia (1), the Russian Federation (1), Sweden (5)
• Chazyan of Canada (1: Quebec)
• Fennian of France (1)
• Volkhov of the Russian Federation (29)
• Valaste of Sweden (2)
• Arenig of China (1), France (1), Morocco (1)
• Ordovician of Canada (12: Nunavut, Ontario, Quebec), China (1), Estonia (5), Ireland (2), Latvia (5), Norway (1), the Russian Federation (16), Spain (5), Sweden (27), the United Kingdom (10), United States (36: California, Colorado, Illinois, Kentucky, Minnesota, Missouri, New York, Ohio, Pennsylvania, Tennessee, Virginia)
Total: 164 collections including 170 occurrences