Parent taxon: Actinodontida according to J. G. Carter et al. 2011
Sister taxa: Actinodontoidea, Amnigenioidea, Cycloconchoidea, Nyassoidea, Oriocrassatelloidea, Palaeomuteloidea
Subtaxa: Actinodontidae Anodontopsidae Baidiostracidae Cycloconchidae Intihuarellidae Redoniidae
Ecology: facultatively mobile infaunal suspension feeder
Distribution:
• Miocene of Japan (1 collection)
• Eocene of United States (1: Colorado)
• Paleocene of United States (27: Colorado, Montana, North Dakota, Wyoming)
• Devonian of Canada (5: Northwest Territories, Nunavut)
• Ordovician of Argentina (5), Australia (6), China (5), the Czech Republic (7), France (3), Spain (4), the United Kingdom (11), United States (11: Indiana, Kentucky, Ohio)
• Arenig of Argentina (7), China (1), France (3), the United Kingdom (1)
Total: 98 collections including 119 occurrences