Phylum Mollusca Linnaeus, 1758 - molluscs
   Class Gastropoda Cuvier, 1795 - snails and slugs
     Subclass Prosobranchia Milne-Edwards, 1848 - prosobranchs see Class Gastropoda Cuvier, 1795
       Order Caenogastropoda Cox, 1960 see Superorder Caenogastropoda Cox, 1960
         Superfamily Rissooidea Gray, 1847
           Family Hydrobiidae Stimpson, 1865
             Subfamily Bythinellinae Kobelt, 1878 see Subfamily Amnicolinae Tryon, 1863
               Genus Bythinella Moquin-Tandon, 1855
                 1 Subgenus Acrophlyctis Cossmann, 1888