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 Pulmonata Cuvier, 1814
             Suborder Eupulmonata Haszprunar & Huber, 1990 see Order Eupulmonata Haszprunar & Huber, 1990
               Infraorder Trimusculiformes Minichev & Starobogatov, 1975 see Superfamily Trimusculoidea Burch, 1945 (1840)
                 1 Superfamily Trimusculoidea Burch, 1945 (1840)