Rhynchonellata - Orthida - Dicoelosiidae
Parent taxon: Dalmanelloidea according to M. Rubel 2011
See also Bassett and Cocks 1974, Jin and Chatterton 1997, Mitchell 1977, Williams et al. 2000, Wright 1964 and Zhang and Boucot 1988
Sister taxa: Angusticardiniidae, Dalmanellidae, Harknessellidae, Heterorthidae, Hypsomoniidae, Kayserellidae, Mystrophoridae, Paurorthidae, Platyorthidae, Portranellidae, Proschizophoriidae, Rhipidomellidae, Tyronellidae
Subtaxa: Dicoelosia Epitomyonia Teichertina
Ecology: stationary epifaunal suspension feeder
Distribution:
• Devonian of Australia (2 collections), Canada (5: Northwest Territories, Quebec, Yukon), China (2), the Czech Republic (6), the Russian Federation (4), Ukraine (1), United States (20: Alaska, Nevada, New York, Oklahoma, Tennessee)
• Whitwellian of Canada (4: Northwest Territories)
• Jaani of Estonia (12), Lithuania (6)
• Niagaran of Canada (1: Québec)
• Silurian to Devonian of United States (1: Oklahoma)
• Silurian of Australia (2), Belarus (1), Canada (32: British Columbia, New Brunswick, Northwest Territories, Nunavut, Quebec, Québec, Yukon, Yukon Territory), China (12), the Czech Republic (8), Estonia (34), Greenland (1), Iran (1), Lithuania (35), Mexico (1), Norway (29), Sweden (22), Ukraine (3), the United Kingdom (45), United States (99: Alabama, Arkansas, California, Illinois, Indiana, Iowa, Missouri, Nevada, New York, Oklahoma, Tennessee, Wisconsin), Venezuela (1)
• Ordovician to Silurian of Norway (1)
• Ordovician of Belgium (6), Canada (11: Northwest Territories, Quebec, Québec, Yukon), China (2), the Czech Republic (4), Estonia (5), Ireland (2), Italy (2), Kazakhstan (1), Latvia (1), Norway (4), the Russian Federation (1), Sweden (3), the United Kingdom (15), United States (16: Alaska, California)
Total: 464 collections including 535 occurrences