Phylum Mollusca Linnaeus, 1758 - molluscs
Class Gastropoda Cuvier, 1795 - snails and slugs
Subclass Opisthobranchia Milne-Edwards, 1848 - opisthobranchs
see Order Opisthobranchia Milne-Edwards, 1848
Order Cephalaspidea Fischer, 1883
Superfamily Bulloidea Gray, 1827
Family Retusidae Thiele, 1925
Genus Volvulella Newton, 1891
1 Subgenus "Volvulella" Newton, 1891
2 Subgenus Paravolvulella Harry, 1967