Phylum Mollusca Linnaeus, 1758 - molluscs
   Subphylum Conchifera Gegenbauer, 1878
     Class Gastropoda Cuvier, 1795 - snails and slugs
       Subclass Orthogastropoda Ponder & Lindberg, 1995
         Superorder Caenogastropoda Cox, 1960
           Order Sorbeoconcha Ponder & Lindberg, 1997
             Suborder Hypsogastropoda Ponder & Lindberg, 1997
               Infraorder Ptenoglossa Gray, 1853
                 Superfamily Triphoroidea Gray, 1847
                   Family Triphoridae Gray, 1847
                     Subfamily Metaxiinae Marshall, 1977