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 Horatiinae Taylor, 1966 see Subfamily Belgrandiinae de Stefani, 1877
               01 Genus Horatia Bourguignat, 1887
               02 Genus Arganiella Giusti & Pezzoli, 1984
               03 Genus Bathinella Millard, 1996, orth. inval. see Genus Bythinella Moquin-Tandon, 1855
               04 Genus Boleana Radoman, 1973
               05 Genus Bythiospeum Bourguignat, 1882
               06 Genus Cavernisa Radoman, 1978
               07 Genus Erythropomatiana Radoman, 1978
               08 Genus Fissuria Boeters, 1981
               09 Genus Gocea Hadzisce, 1956
               10 Genus Hadziella Kuscer, 1932
               11 Genus Hauffenia Pollonera, 1899
               12 Genus Kerkia Radoman, 1978
               13 Genus Iglica Wagner, 1927
               14 Genus Lanzaia Brusina, 1906
               15 Genus Lapparentia Berthelin, 1885
               16 Genus Moitessieria Bourguignat, 1863
               17 Genus Montjavoultia Raspail, 1909
               18 Genus Ohrigocea Hadzisce, 1956
               19 Genus Paladilhia Bourguignat, 1865
               20 Genus Pezzolia Bodon & Giusti, 1986
               21 Genus Plagigeyeria Tomlin, 1930
               22 Genus Pontobelgrandiella Radoman, 1978
               23 Genus Saganoa Kuroda, Habe & Tamu, 1958
               24 Genus Saxurinator Schütt, 1960
               25 Genus Sogdamnicola Izzatullaev, Sitnikova & Starobogatov, 1984
               26 Genus Strugia Radoman, 1973