Phylum Mollusca Linnaeus, 1758 - molluscs
   Subphylum Conchifera Gegenbauer, 1878
     Class Gastropoda Cuvier, 1795 - snails and slugs
       Subclass Orthogastropoda Ponder & Lindberg, 1995
         Superorder "hot vent taxa" Ponder & Lindberg, 1997 see Superorder Vetigastropoda Salvini-Plawen, 1980
           Order Neomphaolida see Order Neomphalida Sitnikova & Starobogatov, 1983
             1 Superfamily Neomphaloidea McLean, 1981
             2 Superfamily Peltospiroidea J.H. McLean, 1989 see Superfamily Neomphaloidea McLean, 1981