[Phylum] [Arthropoda] Siebold, 1848 - arthropods
   Chelicerata Heymons, 1901
     Euchelicerata Weygoldt & Paulus, 1979
       [Subclass] Acari Leach, 1817 - mites and ticks
         [Order] Acariformes Zakhvatkin, 1952 see Superorder Acariformes Zakhvatkin, 1952
           Suborder Trombidiformes Reuter, 1909 see Order Trombidiformes Reuter, 1909
             Infraorder Prostigmata Kramer, 1877 see Suborder Prostigmata Kramer, 1877
               Supercohort Anystides van der Hammen, 1972 see Infraorder Anystina van der Hammen, 1972
                 Cohort Parasitengona Oudemans, 1909 - chiggers, velvet mites, water mites, and their relatives see Hyporder Parasitengona Oudemans, 1909
                   Subcohort Hydracarnidiae Dunlop, Penney & Jekel, 2010, orth. inval. see Subcohort Hydrachnidiae
                     1 Superfamily Hydryphantoidea Piersig, 1896 - water mites
                     2 Superfamily Eylaoidea Leach, 1815
                     3 Superfamily Hydrovolzioidea Thor, 1905
                     4 Superfamily Hydrachnoidea Leach, 1815 [monotypic]
                     5 Superfamily Lebertoidea "Thor, 1900", orth. inval. see Superfamily Lebertioidea Thor, 1900
                     6 Superfamily Hygrobatoidea Koch, 1842
                     7 Superfamily Arrenuroidea Thor, 1900