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 Thecosomata Blainville, 1824 [monotypic] - shelled pteropods
see Suborder Thecosomata Blainville, 1824
Suborder Euthecosomata Meisenheimer, 1905 [monotypic]
see Infraorder Euthecosomata Meisenheimer, 1905
Superfamily Spiratelloidea
see Superfamily Cavolinioidea Gray, 1850 (1815)
Family Cavoliniidae Gray, 1850 (1815)
1 Subfamily Cavoliniinae Gray, 1850 (1815)
2 Subfamily Clionae van der Spoel, 1967, orth. inval.
see Subfamily Clioinae Jeffreys, 1869
3 Subfamily Cuvierininae van der Spoel, 1967, nom. protect. [monotypic]