Phylum Mollusca Linnaeus, 1758 - molluscs
   Class Gastropoda Cuvier, 1795 - snails and slugs
     Subclass Heterobranchia Burmeister, 1837 [monotypic] see Superorder Heterobranchia Burmeister, 1837
       Order Heterostropha Fischer, 1885
         Superfamily Pyramidelloidea Gray, 1840
           1 Family Pyramidellidae Gray, 1840
           2 Family Amathinidae Ponder, 1987
           3 Family Ebalidae Warén, 1995 see Family Murchisonellidae Casey, 1904
           4 Family Tjaernoeidae Warén, 1991, orth. inval. [monotypic] see Family Tjaernoeiidae Warén, 1991