†suborder Retziidina Boucot et al. 1964 (lamp shell)
Parent taxon: Athyridida according to A. Williams et al. 2002
Sister taxa: Anoplothecoidea, Athyrididina, Dayioidea, Koninckinidina, Uncitoidea
Subtaxa: Mongolospiroidea, Retzioidea, Rhynchospirinoidea
Ecology: stationary low-level epifaunal suspension feeder