Phylum Mollusca Linnaeus, 1758 - molluscs
   Conchifera Gegenbaur, 1878 see Subphylum Conchifera Gegenbauer, 1878
     Cyrtosoma
       Class Gastropoda Cuvier, 1795 - snails and slugs
         Orthogastropoda Ponder & Lindberg, 1995 see Subclass Orthogastropoda Ponder & Lindberg, 1995
           Apogastropoda Salvini-Plawen & Haszprunar, 1987
             1 Caenogastropoda Cox, 1960 see Superorder Caenogastropoda Cox, 1960
             2 Heterobranchia Burmeister, 1837 see Superorder Heterobranchia Burmeister, 1837