†superfamily Dayioidea Waagen 1883 (lamp shell)
Parent taxon: Athyridida according to A. Williams et al. 2002
Sister taxa: Anoplothecoidea, Athyrididina, Koninckinidina, Retziidina, Uncitoidea
Subtaxa: Dayiidae
Ecology: stationary low-level epifaunal suspension feeder
Distribution:
• Devonian of the Czech Republic (1 collection), Ukraine (2)
• Silurian to Devonian of the Czech Republic (1)
• Silurian of Belarus (4), Canada (1: Northwest Territories), the Czech Republic (14), Estonia (3), France (1), Latvia (5), Lithuania (43), Morocco (1), Poland (2), the Russian Federation (5), Sweden (6), Tajikistan (1), Ukraine (11), the United Kingdom (37)
Total: 138 collections including 148 occurrences