Parent taxon: Tergomya according to P. J. Wagner 2023
See also Bouchet et al. 2005
Sister taxa: Archinacellida, Cyrtonellida, Kiringellida, Tryblidiida
Subtaxa: Scenellidae
Type: Scenellidae
Ecology: slow-moving low-level epifaunal grazer
Distribution:
• Devonian of Australia (1 collection), Austria (3), the Czech Republic (2), United States (1: Michigan)
• Silurian of Canada (1: Ontario), the Czech Republic (1)
• Ordovician of the Czech Republic (2), North Korea (1), the Russian Federation (2), South Korea (1), United States (23: Illinois, Iowa, Michigan, Minnesota)
• Chazy of Canada (1: Quebec), United States (5: New York)
• Cassinian of United States (1: Vermont)
• Cambrian of Antarctica (2), Australia (1), Canada (32: British Columbia, Newfoundland and Labrador, Northwest Territories, Quebec), China (16), Mexico (1), Norway (1), the Russian Federation (2), Spain (1), Sweden (2), United States (3: Massachusetts, New York, Utah)
Total: 106 collections including 117 occurrences