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 Heterostropha Fischer, 1885
             Superfamily Valvatoidea Gray, 1840
               1 Family Cornirostridae Ponder, 1990
               2 Family Hyalogyrinidae Warén & Bouchet, 1993
               3 Family Orbitestellidae Iredale, 1917
               4 Family Valvatidae Gray, 1840
               5 Family Xylodisculidae Warén, 1992