Hydrachnidia Krantz, 1978 - water mites
   Superfamily Hygrobatoidea Koch, 1842
     Family Lethaxonidae Cook, Smith & Harvey, 2000
       1 Genus Lethaxona Viets, 1932
       2 Genus Lethaxonella Cook, 1963
       3 Genus Transitia Valdecasas, 2010