†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