Phylum Mollusca Linnaeus, 1758 - molluscs
Subphylum Conchifera Gegenbauer, 1878
Class Gastropoda Cuvier, 1795 - snails and slugs
Subclass Orthogastropoda Ponder & Lindberg, 1995
Superorder Heterobranchia Burmeister, 1837
Order Opisthobranchia Milne-Edwards, 1848
Suborder Notaspidea Fischer, 1883
1 Superfamily Tylodinoidea J.E. Gray, 1847
see Superfamily Umbraculoidea Dall, 1889 (1827)
2 Superfamily Pleurobranchoidea Gray, 1827