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 Littoridininae Thiele, 1928
               01 Genus Littoridina Souleyet, 1852
               02 Genus Aphaostracon Thompson, 1968
               03 Genus Balconorbis Hershler & Longley, 1986
               04 Genus Brachypirgulina Vaught, 1989, orth. inval. see Genus Brachypyrgulina Haas, 1955
               05 Genus Coahuilix Taylor, 1966
               06 Genus Cochliopina Morrison, 1946
               07 Genus Ecpomastrum Haas, 1957
               08 Genus Durangonella Morrison, 1945
               09 Genus Heligmopoma Haas, 1955
               10 Genus Heleobia Stimpson, 1865
               11 Genus Heleobops Thompson, 1968
               12 Genus Littoridinops Pilsbry, 1952
               13 Genus Lyrodes Döring, 1885
               14 Genus Mexipyrgus Taylor, 1966
               15 Genus Mexithauma Taylor, 1966
               16 Genus Paludiscala Taylor, 1966
               17 Genus Rhamphopoma Haas, 1955
               18 Genus Rufolacuna Ponder, 1976
               19 Genus Spurwinkia Davis & Mazurkiewicz, 1982
               20 Genus Strombopoma Haas, 1955
               21 Genus Stygopyrgus Hershler & Longley, 1986
               22 Genus Tryonia Stimpson, 1865
               23 Genus Zetekina Morrison, 1947