Hydrachnidia Krantz, 1978 - water mites
   Superfamily Hygrobatoidea Koch, 1842
     Family Aturidae Thor, 1900
       Subfamily Axonopsinae Viets, 1929
         01 Genus Adelaxonopsella Cook, 1974
         02 Genus Albaxona Szalay, 1944
         03 Genus Axonopsalbia Viets, 1914
         04 Genus Axonopsella Lundblad, 1930
         05 Genus Axonopsis Piersig, 1893
         06 Genus Barbaxona Viets, 1924
         07 Genus Barbaxonella Lundblad, 1954
         08 Genus Barbaxonopsalbia Wiles, 1991
         09 Genus Brachypoda Lebert, 1879
         10 Genus Brachypodopsis Piersig, 1903
         11 Genus Cubaxonopsis Orghidan, Gruia & Iavorschi, 1981
         12 Genus Erebaxonopsis Motas & Tanasachi, 1947
         13 Genus Estellacarus Habeeb, 1954
         14 Genus Hexaxonopsalbia Motaş, 1928
         15 Genus Haloaxonopsis Pešic, Smit & Saboori, 2012
         16 Genus Hexaxonopsis Viets, 1926
         17 Genus Javalbia Viets, 1935
         18 Genus Javalbiella Cook, 1966
         19 Genus Kedacarus Cook, 1967, orth. inval. see Genus Khedacarus Cook, 1967
         20 Genus Lagoenaxonopsalbia Pešić & Smit, 2018
         21 Genus Ljania Thor, 1898
         22 Genus Miraxona Lundblad, 1936
         23 Genus Miraxonides Lundblad, 1938
         24 Genus Neoalbia Lundblad, 1936
         25 Genus Neoaxona Lundblad, 1936
         26 Genus Neoaxonopsalbia Cook, 1966
         27 Genus Neoaxonopsis Lundblad, 1938
         28 Genus Neobarbaxona Cook, 1966
         29 Genus Neobrachypoda Koenike, 1914
         30 Genus Ocybrachypoda Cook, 1974
         31 Genus Omanaxonopsis Smit & Pešic, 2010
         32 Genus Parabrachypoda Viets, 1929
         33 Genus Paraxonopsis Motas & Tanasachi, 1947
         34 Genus Polyaxonopsella Lundblad, 1943
         35 Genus Prymnopsella Gerecke, 1991
         36 Genus Pseudaxonopsalbia Viets, 1942
         37 Genus Siamaxonopsis Smit, 2016
         38 Genus Sinaxonopsis Yi & Jin, 2012
         39 Genus Stokaxonopsis Cook, 1967
         40 Genus Stygalbiella Cook, 1974
         41 Genus Submiraxona Lundblad, 1937
         42 Genus Sumatralbia Viets, 1931
         43 Genus Subaxonopsalbia Cook, 1966
         44 Genus Uenaxonopsis Imamura, 1961
         45 Genus Vagabundia Valdecasas, 2008
         46 Genus Vicinaxonopsis Cook, 1974
         47 Genus Villaxonopsalbia Cook, 1999
         48 Genus Woolastookia Habeeb, 1954