†order Pteropoda Cuvier 1804 (snail)
Parent taxon: Euopisthobranchia according to P. Bouchet et al. 2017
See also Burns et al. 2005 and Harris and Palmer 1947
Sister taxa: Aplysiida, Runcinida, Umbraculida
Subtaxa: Euthecosomata Gymnosomata Pseudothecosomata
Ecology: epifaunal