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 Peraclidae Tesch, 1913 [monotypic]
1 Genus Peracle Forbes, 1844