living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
     Kingdom Animalia Linnaeus, 1758 - animals
       Subkingdom Eumetazoa Butschli, 1910 see [unranked] Eumetazoa Bütschli, 1910
         Phylum Arthropoda Siebold, 1848 - arthropods
           Subphylum Chelicerata Heymons, 1901
             Class Arachnida Lamarck, 1801
               Subclass Acari Leach, 1817 - mites and ticks
                 Order Acariformes Zakhvatkin, 1952 see Superorder Acariformes Zakhvatkin, 1952
                   Suborder Prostigmata Kramer, 1877
                     Cohort Parasitengona Oudemans, 1909 - chiggers, velvet mites, water mites, and their relatives see Hyporder Parasitengona Oudemans, 1909
                       Superfamily Hygrobatoidea Koch, 1842
                         01 Family Astacocrotidae see Family Astacocrotonidae Thor, 1927
                         02 Family Aturidae Thor, 1900
                         03 Family Axonopsidae Viets, 1929 see Subfamily Axonopsinae Viets, 1929
                         04 Family Feltriidae Viets, 1926
                         05 Family Ferradasiidae Cook, 1980
                         06 Family Hygrobatidae Koch, 1842
                         07 Family Limnesiidae Thor, 1900
                         08 Family Omartacaridae Cook, 1963
                         09 Family Pionidae Thor, 1900
                         10 Family Pontarachnidae Koenike, 1910
                         11 Family Unionicolidae Oudemans, 1909