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 Pyramidelloidea Gray, 1840
               1 Family Amathinidae Ponder, 1987
               2 Family Anisocyclidae van Aartsen, 1995 see Family Murchisonellidae Casey, 1904
               3 Family Cimidae Warén, 1993
               4 Family Odostomiidae Casey, 1904 see Tribe Odostomiini Casey, 1904
               5 Family Pyramidellidae Gray, 1840
               6 Family Syrnolidae Saurin, 1958 see Subfamily Syrnolinae Saurin, 1958
               7 Family Tjaernoeidae Warén, 1991, orth. inval. see Family Tjaernoeiidae Warén, 1991
               8 Family Turbonillidae Bronn, 1849 see Subfamily Turbonillinae Bronn, 1849