Phylum Mollusca Linnaeus, 1758 - molluscs
   Class Gastropoda Cuvier, 1795 - snails and slugs
     1 Subclass Prosobranchia Milne-Edwards, 1848 - prosobranchs see Class Gastropoda Cuvier, 1795
     2 Subclass Heterobranchia Burmeister, 1837 [monotypic] see Superorder Heterobranchia Burmeister, 1837
     3 Subclass Opisthobranchia Milne-Edwards, 1848 - opisthobranchs see Order Opisthobranchia Milne-Edwards, 1848
     4 Subclass Gymnomorpha Salvini-Plawen, 1970 see Subclass Pulmonata Cuvier, 1814
     5 Subclass Pulmonata Cuvier, 1814 [monotypic] - land snails and slugs see Order Pulmonata Cuvier, 1814
     6 Subclass Divasibranchia Minichev & Starobogatov, 1975