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 Hydrobiinae Stimpson, 1865
               01 Genus Hydrobia Hartmann, 1821
               02 Genus Adriohydrobia Radoman, 1973
               03 Genus Antroselates Hubricht, 1963
               04 Genus Aroapyrgus Baker, 1931
               05 Genus Catapyrgus Climo, 1974
               06 Genus Fluvidona Iredale, 1937
               07 Genus Fluviopupa Pilsbry, 1911
               08 Genus Hadopyrgus Climo, 1974
               09 Genus Hemistomia Crosse, 1872
               10 Genus Heterocyclus Crosse, 1872
               11 Genus Hoyia Baker, 1926
               12 Genus Lithoglyphoides Sturany & Wagner, 1915
               13 Genus Lobogenes Pilsbry & Bequaert, 1927
               14 Genus Obrovia Radoman, 1974
               15 Genus Opacuincola Ponder, 1966
               16 Genus Paxillostium Gardner, 1970
               17 Genus Petterdiana Brazier, 1896
               18 Genus Phreatodrobia Hershler & Longley, 1986
               19 Genus Phreatoceras Hershler & Longley, 1987
               20 Genus Potamolithus Pilsbry, 1896
               21 Genus Probythinella Thiele, 1928
               22 Genus Pseudamnicola Paulucci, 1878
               23 Genus Pterides Pilsbry, 1909
               24 Genus Pyrgophorus Ancey, 1888
               25 Genus Sellia Raincourt, 1884
               26 Genus Soapitia Binder, 1961
               27 Genus Staadtia Schlickum, 1961
               28 Genus Syrofontana Schutt, 1983
               29 Genus Tatea Tenison-Woods, 1879
               30 Genus Trichonia Schütt, 1980