Artiopoda - Phacopida - Pterygometopidae
Parent taxon: Pterygometopidae according to R. Ludvigsen and B. D. E. Chatterton 1982
Sister taxa: Calliops, Chasmopinae, Creatarginae, Homalops, Monorakinae, Pterygometopinae, Truncatometopus, Volkops, Yankaoia
Subtaxa: Calyptaulax Denella Eomonorachus Liocnemis Podowrinella Sceptaspis Tricopelta
Ecology: fast-moving low-level epifaunal carnivore
Distribution:
• Silurian of the United Kingdom (9 collections)
• Whiterockian of Canada (13: Newfoundland and Labrador, Northwest Territories, Quebec), United States (17: Nevada, New York, Oklahoma, Vermont)
• Chazyan of Canada (16: Northwest Territories), United States (18: New York, Oklahoma, Tennessee)
• Ordovician to Silurian of the Russian Federation (1)
• Ordovician of Belgium (1), Canada (50: British Columbia, Newfoundland, Northwest Territories, Nunavut, Nunvait, Ontario, Quebec), Ireland (8), Norway (24), the Russian Federation (9), Sweden (5), the United Kingdom (28), United States (102: Georgia, Illinois, Illinois, Iowa, Indiana, Iowa/Wisconsin, Kentucky, Minnesota, Missouri, Nevada, New York, Oklahoma, Virginia)
• Ibexian of United States (1: Nevada)
Total: 302 collections including 335 occurrences