Trilobita - Proetida - Dimeropygidae
Synonym: Toernquistiidae Hupé 1953
Parent taxon: Proetida according to R. A. Fortey and D. L. Bruton 2013
See also Adrain 2011, Adrain and Westrop 2007, Chatterton et al. 1998, Fortey and Droser 1999, Owens 2004 and Whittington et al. 1997
Sister taxa: Aulacopleuroidea, Bathyuridae, Bathyuroidea, Cammingella, Huanoproetus, Hystricuridae, Niachangella, Parapalebralia, Phaselops, Proetoidea, Pusillaboles, Radonia, Sperginaspis, Tayanaella, Tekinia, Telephinidae, Vitaella
Subtaxa: Bearriverops Chomatopyge Dimeropyge Dimeropygiella Heckethornia Ischyrotoma Mesotaphraspidinae Mesotaphraspis Pseudohystricurus Toernquistia Toernquistina Tulepyge
Ecology: fast-moving low-level epifaunal deposit feeder
Distribution:
• Whiterockian of Canada (1: Newfoundland and Labrador collection), Norway (1), United States (16: Nevada, New York, Utah, Vermont)
• Chazyan of Canada (9: Newfoundland and Labrador, Northwest Territories)
• Arenigian of Canada (1: Northwest Territories)
• Arenig of Greenland (1), United States (1: New York)
• Ordovician of Argentina (19), Australia (3), Canada (42: Alberta, Newfoundland, Newfoundland and Labrador, Northwest Territories, Nunavut, Quebec), China (2), Ireland (2), Kazakhstan (2), Norway (10), the Russian Federation (1), the United Kingdom (15), United States (117: California, Colorado, Idaho, Missouri, Nevada, Oklahoma, Pennsylvania, Texas, Utah, Virginia)
• Tremadoc of Canada (4: Alberta)
• Ibexian of United States (1: Nevada)
• Skullrockian of United States (1: Utah)
Total: 249 collections including 289 occurrences