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 Arrenuroidea Thor, 1900
                         Family Acalyptonotidae Walter, 1911
                         Family Arenohydracaridae Cook, 1974
                         Family Athienemaniidae see Family Athienemanniidae Viets, 1922
                         Family Athienemanniidae Viets, 1922
                         Family Bogatiidae Motaş & Tanasachi, 1948
                         Family Chappuisididae Motaş & Tanasachi, 1946
                         Family Chappusididae see Family Chappuisididae Motaş & Tanasachi, 1946
                         Family Harpagopalpidae Viets, 1924
                         Family Hungarohydracharidae see Family Hungarohydracaridae Motaş & Tanasachi, 1959
                         Family Kantacaridae Imamura, 1959
                         Family Krendowskiidae Viets, 1926
                         Family Laversiidae Cook, 1955
                         Family Mideidae Thor, 1911
                         Family Mideopsidae Koenike, 1910
                         Family Momoniidae Viets, 1926
                         Family Neoacaridae Motaş & Tanasachi, 1947
                         Family Nipponacaridae Imamura, 1959
                         Family Uchidastygacaridae Imamura, 1956 see Family Chappuisididae Motaş & Tanasachi, 1946
                         Family Arrenuridae Thor, 1900
                           1 Genus Micruracaropsis Viets, 1939
                           2 Subfamily Africasiinae Cook, 1974
                           3 Subfamily Arrenurinae Thor, 1900 see Family Arrenuridae Thor, 1900