Parent taxon: Athyridida according to A. Williams et al. 2002
Sister taxa: Athyrididina, Dayioidea, Koninckinidina, Retziidina, Uncitoidea
Subtaxa: Anoplothecidae Kayseriidae Neocoelia
Ecology: stationary low-level epifaunal suspension feeder
Distribution:
• Givetian of France (3 collections)
• Devonian of Argentina (2), Australia (10), Brazil (2), Canada (15: British Columbia, Northwest Territories, Nunavut, Ontario, Quebec, Yukon), China (4), Colombia (1), the Czech Republic (7), France (5), Germany (18), Kazakhstan (1), Morocco (1), Poland (2), South Africa (2), Spain (3), Ukraine (1), United States (70: Maryland, Nevada, New York, Oklahoma, Pennsylvania, Tennessee), Vietnam (1)
• Silurian to Devonian of Argentina (1), Pakistan (1), United States (1: Oklahoma)
• Silurian of Argentina (4), Australia (5), Canada (10: Northwest Territories, Ontario, Quebec, Yukon, Yukon Territory), China (2), the Czech Republic (4), Greenland (2), Lithuania (1), Sweden (4), Ukraine (1), United States (104: Alaska, Georgia, Indiana, Iowa, Maryland, Michigan, New Hampshire, New York, Oklahoma, Virginia), Venezuela (1)
Total: 289 collections including 302 occurrences