Mollusca Linnaeus, 1758 - molluscs
   Conchifera Gegenbauer, 1878
     Gastropoda Cuvier, 1795 - snails and slugs
       Orthogastropoda Ponder & Lindberg, 1995
         Caenogastropoda Cox, 1960
           Sorbeoconcha Ponder & Lindberg, 1997
             Hypsogastropoda Ponder & Lindberg, 1997
               1 Littorinimorpha Pchelintsev, 1963
               2 Ptenoglossa Gray, 1853
               3 Neogastropoda Wenz, 1938