| Acalyptonotidae Walter, 1911 | | 1 | Species | Taxom |
| Acaridae Latreille, 1802 | Acarid mites | 158 | Species | Taxom |
| Acaronychidae Grandjean, 1932 | | 10 | Species | Taxom |
| Acarophenacidae Cross, 1965 | | 12 | Species | Taxom |
| Acherontacaridae Cook, 1967 | | 8 | Species | Taxom |
| Achipteriidae Thor, 1929 | | 91 | Species | Taxom |
| Adamystidae Cunliffe, 1957 | | 10 | Species | Taxom |
| Adelphacaridae Grandjean, 1954 | | 4 | Species | Taxom |
| Aeroglyphidae Zakhvatkin, 1941 | | 1 | Species | Taxom |
| Aleurodamaeidae Paschoal & J..., 1985 | | 3 | Species | Taxom |
| Algophagidae Fain, 1974 | | 7 | Species | Taxom |
| Alicorhagiidae Grandjean, 1939 | | 9 | Species | Taxom |
| Alloptidae Gaud, 1957 | | 52 | Species | Taxom |
| Allotanaupodidae Zhang & Fan, 2007 | | 1 | Species | Taxom |
| Alycidae Canestrini &..., 1877 | | 26 | Species | Taxom |
| Ameridae Grandjean, 1965 | | 9 | Species | Taxom |
| Amerobelbidae Grandjean, 1954 | | 14 | Species | Taxom |
| Ameronothridae Willmann, 1931 | | 17 | Species | Taxom |
| Ametroproctidae Subías, 2004 | | 5 | Species | Taxom |
| Analgidae Trouessart &..., 1884 | Feather mites | 67 | Species | Taxom |
| Anderemaeidae Balogh, 1972 | | 1 | Species | Taxom |
| Anisitsiellidae Koenike, 1910 | | 22 | Species | Taxom |
| Anystidae Oudemans, 1936 | Whirligig Mites | 54 | Species | Taxom |
| Aphelacaridae Grandjean, 1954 | | 2 | Species | Taxom |
| Apheviderulicidae Gerecke, Smi..., 1999 | | 2 | Species | Taxom |
| Apionacaridae Gaud & Atyeo, 1977 | | 2 | Species | Taxom |
| Arborichthoniidae J. & P. Balogh, 1992 | | 1 | Species | Taxom |
| Arceremaeidae Balogh, 1972 | | 1 | Species | Taxom |
| Archaeorchestidae Arillo & Sub..., 2000 | | 4 | Species | Taxom |
| Arrenuridae Thor, 1900 | | 173 | Species | Taxom |
| Ascouracaridae Gaud & Atyeo, 1976 | | 5 | Species | Taxom |
| Astegistidae Balogh, 1961 | | 33 | Species | Taxom |
| Athienemanniidae Viets, 1922 | | 13 | Species | Taxom |
| Atopochthoniidae Grandjean, 1949 | | 3 | Species | Taxom |
| Atopomelidae Fain, 1972 | | 10 | Species | Taxom |
| Aturidae Thor, 1900 | | 116 | Species | Taxom |
| Audycoptidae (Lavoipierre, 1964) | | 1 | Species | Taxom |
| Autognetidae Grandjean, 1960 | | 35 | Species | Taxom |
| Avenzoariidae Oudemans, 1905 | | 51 | Species | Taxom |
| Axonopsidae (Habeeb, 1953) | | 1 | Species | Taxom |
| Barbutiidae Robaux, 1975 | | 6 | Species | Taxom |
| Bdellidae Dugès, 1834 | Snout Mites | 62 | Species | Taxom |
| Belbidae (Willmann, 1931) | | 12 | Species | Taxom |
| Belbodamaeidae (Bulanova-Zac..., 1967) | | 1 | Species | Taxom |
| Bembidiacaridae Khuastov, 2000 | | 1 | Species | Taxom |
| Bogatiidae Motas & Tana..., 1948 | | 1 | Species | Taxom |
| Brachychthoniidae Thor, 1934 | | 182 | Species | Taxom |
| Caeculidae Berlese, 1883 | Rake-legged mites | 34 | Species | Taxom |
| Caleremaeidae Grandjean, 1965 | | 6 | Species | Taxom |
| Caligonellidae Grandjean, 1944 | | 48 | Species | Taxom |
| Caloppiidae (Balogh, 1960) | | 2 | Species | Taxom |
| Calyptostomatidae Oudemans, 1923 | | 11 | Species | Taxom |
| Camerobiidae Southcott, 1957 | Stilt-legged mites | 90 | Species | Taxom |
| Camisiidae Oudemans, 1900 | | 12 | Species | Taxom |
| Canestriniidae Berlese, 1884 | | 76 | Species | Taxom |
| Caraboacaridae Mahunka, 1970 | | 3 | Species | Taxom |
| Carabodidae Koch, 1837 | | 106 | Species | Taxom |
| Carpoglyphidae Oudemans, 1923 | Driedfruit mites | 6 | Species | Taxom |
| Cepheidae (Berlese, 1896) | | 5 | Species | Taxom |
| Cepheusidae Berlese, 1896 | | 66 | Species | Taxom |
| Ceratoppiidae (Kunst, 1971) | | 23 | Species | Taxom |
| Ceratozetidae Jacot, 1925 | | 290 | Species | Taxom |
| Chaetodactylidae Zakhvatkin, 1941 | | 16 | Species | Taxom |
| Chamobatidae Thor, 1937 | | 61 | Species | Taxom |
| Chapuisididae | | 2 | Species | Taxom |
| Cheylabididae Gaud, 1983 | | 1 | Species | Taxom |
| Cheyletidae Leach, 1815 | | 154 | Species | Taxom |
| Chirodiscidae Trouessart, 1892 | | 12 | Species | Taxom |
| Chortoglyphidae Berlese, 1897 | | 2 | Species | Taxom |
| Cloacaridae Camin, Moss,..., 1967 | | 4 | Species | Taxom |
| Cocceupodidae Jesionowska, 2010 | | 20 | Species | Taxom |
| Collohmanniidae Grandjean, 1958 | | 2 | Species | Taxom |
| Cosmochthoniidae Grandjean, 1946 | | 35 | Species | Taxom |
| Crotoniidae Thorell, 1876 | | 39 | Species | Taxom |
| Cryptognathidae Luxton, 1973 | | 42 | Species | Taxom |
| Ctenacaridae Grandjean, 1954 | | 10 | Species | Taxom |
| Ctenobelbidae Grandjean, 1965 | | 37 | Species | Taxom |
| Cunaxidae Thor, 1902 | Predatory Mites | 38 | Species | Taxom |
| Cymbaeremaeidae Sellnick, 1928 | | 24 | Species | Taxom |
| Cytoditidae Oudemans, 1908 | | 1 | Species | Taxom |
| Damaeidae Berlese, 1896 | | 300 | Species | Taxom |
| Damaeolidae Grandjean, 1965 | | 10 | Species | Taxom |
| Dampfiellidae Balogh, 1961 | | 1 | Species | Taxom |
| Dasythyreidae Walter & Gerson, 1998 | | 2 | Species | Taxom |
| Demodecidae Nicolet, 1855 | Follicle mites | 68 | Species | Taxom |
| Dermationidae Fain, 1965 | | 11 | Species | Taxom |
| Dermoglyphidae Mégnin & Tro..., 1884 | | 6 | Species | Taxom |
| Diptilomiopidae Boczek, 1964 | | 67 | Species | Taxom |
| Dolichocybidae Mahunka, 1970 | | 7 | Species | Taxom |
| Dytiscacaridae Hajikanbar a..., 2018 | | 1 | Species | Taxom |
| Echimyopodidae Fain, 1967 | | 3 | Species | Taxom |
| Edbakerellidae (André, 2004) | | 0 | Species | Taxom |
| Eniochthoniidae Grandjean, 1947 | | 7 | Species | Taxom |
| Epidermoptidae Trouessart, 1892 | | 27 | Species | Taxom |
| Epilohmanniidae Oudemans, 1923 | | 21 | Species | Taxom |
| Epimerellidae Ayyildiz & L..., 1989 | | 9 | Species | Taxom |
| Epimyodicidae Fain, Lukosc..., 1982 | | 3 | Species | Taxom |
| Eremaeidae Oudemans, 1900 | | 67 | Species | Taxom |
| Eremellidae Balogh, 1961 | | 3 | Species | Taxom |
| Eremobelbidae Balogh, 1961 | | 6 | Species | Taxom |
| Eremulidae Grandjean, 1965 | | 7 | Species | Taxom |
| Ereynetidae Schrank, 1776 | | 47 | Species | Taxom |
| Eriophyidae Nalepa, 1898 | Blister mites | 1106 | Species | Taxom |
| Erythracaridae (Oudemans, 1936) | | 9 | Species | Taxom |
| Erythraeidae Oudemans, 1902 | | 429 | Species | Taxom |
| Euglycyphagidae Fain & Philips, 1977 | | 2 | Species | Taxom |
| Eulohmanniidae Grandjean, 1931 | | 3 | Species | Taxom |
| Eupalopsellidae Willmann, 1952 | | 15 | Species | Taxom |
| Euphthiracaridae Jacot, 1930 | | 43 | Species | Taxom |
| Eupodidae Strandtmann, 1967 | Eupodid mites | 44 | Species | Taxom |
| Eustathiidae Oudemans, 1905 | | 8 | Species | Taxom |
| Eylaidae Leach, 1815 | | 56 | Species | Taxom |
| Falculiferidae Oudemans, 1905 | | 3 | Species | Taxom |
| Feltriidae Viets, 1926 | | 36 | Species | Taxom |
| Fortuyniidae Hammen, 1963 | | 4 | Species | Taxom |
| Freyanidae Dubinin, 1953 | | 22 | Species | Taxom |
| Frontipodopsidae Viets, 1931 | | 1 | Species | Taxom |
| Gabuciniidae Gaud & Atyeo, 1975 | | 11 | Species | Taxom |
| Galumnellidae Piffl, 1970 | | 3 | Species | Taxom |
| Galumnidae Jacot, 1925 | | 153 | Species | Taxom |
| Gastronyssidae Fain, 1956 | | 4 | Species | Taxom |
| Gaudoglyphidae (W.A. Bruce &..., 1976) | | 1 | Species | Taxom |
| Gehypochthoniidae Strenzke, 1963 | | 4 | Species | Taxom |
| Glaesacaridae | | 1 | Species | Taxom |
| Glycyphagidae De Geer, 1778 | | 58 | Species | Taxom |
| Granuloppiidae Balogh, 1983 | | 1 | Species | Taxom |
| Gustaviidae Oudemans, 1900 | | 11 | Species | Taxom |
| Gymnodamaeidae Grandjean, 1954 | | 61 | Species | Taxom |
| Halacaridae Murray, 1877 | Sea mites | 230 | Species | Taxom |
| Hammeriellidae Paschoal, 1989 | | 0 | Species | Taxom |
| Haplochthoniidae Van der Hammen, 1959 | | 9 | Species | Taxom |
| Haplozetidae Grandjean, 1936 | | 58 | Species | Taxom |
| Harpirhynchidae Dubinin, 1957 | | 52 | Species | Taxom |
| Hemileiidae (J. & P. Balogh, 1984) | | 37 | Species | Taxom |
| Hemisarcoptidae Oudemans, 1904 | | 12 | Species | Taxom |
| Hermanniellidae Grandjean, 1934 | | 25 | Species | Taxom |
| Hermanniidae Sellnick, 1928 | | 26 | Species | Taxom |
| Heterocheylidae Trägårdh, 1950 | | 0 | Species | Taxom |
| Heterochthoniidae (Grandjean, 1954) | | 6 | Species | Taxom |
| Heteropsoridae Oudemans, 1908 | | 1 | Species | Taxom |
| Histiostomatidae Berlese, 1897 | | 176 | Species | Taxom |
| Homocaligidae Wood, 1969 | | 3 | Species | Taxom |
| Humerobatidae Grandjean, 1970 | | 28 | Species | Taxom |
| Hungarobelbidae (Miko & Travé, 1996) | | 13 | Species | Taxom |
| Hungarohydracaridae Motas & Tana..., 1959 | | 2 | Species | Taxom |
| Hyadesiidae Halbert, 1915 | | 14 | Species | Taxom |
| Hydrachnidae Leach, 1815 | | 51 | Species | Taxom |
| Hydrodromidae Viets, 1936 | | 4 | Species | Taxom |
| Hydrovolziidae Thor, 1905 | | 5 | Species | Taxom |
| Hydrozetidae Grandjean, 1954 | | 12 | Species | Taxom |
| Hydryphantidae Piersig, 1896 | | 165 | Species | Taxom |
| Hygrobatidae Koch, 1842 | | 145 | Species | Taxom |
| Hypochthoniidae Berlese, 1910 | | 11 | Species | Taxom |
| Hypoderatidae (Murray, 1877) | | 17 | Species | Taxom |
| Hypoderidae Murray, 1877 | | 4 | Species | Taxom |
| Iolinidae Pritchard, 1956 | | 60 | Species | Taxom |
| Johnstonianidae Thor, 1935 | | 30 | Species | Taxom |
| Knemidokoptidae (Lavoipierre ..., 1951) | | 11 | Species | Taxom |
| Kodiakellidae Hammer, 1967 | | 1 | Species | Taxom |
| Kramerellidae Gaud & Mouchet, 1961 | | 20 | Species | Taxom |
| Krendowskiidae Viets, 1926 | | 1 | Species | Taxom |
| Kytoditidae (Oudemans, 1908) | | 2 | Species | Taxom |
| Labidostommatidae Oudemans, 1904 | | 34 | Species | Taxom |
| Lamellareidae Balogh, 1972 | | 1 | Species | Taxom |
| Laminosioptidae Vitzthum, 1931 | | 8 | Species | Taxom |
| Lardoglyphidae Oudemans, 1927 | | 0 | Species | Taxom |
| Lebertiidae Thor, 1900 | | 166 | Species | Taxom |
| Leeuwenhoekiidae Womersley, 1944 | Chigger mites | 74 | Species | Taxom |
| Lemurnyssidae Fain, 1957 | | 1 | Species | Taxom |
| Liacaridae Sellnick, 1928 | | 117 | Species | Taxom |
| Licneremaeidae Grandjean, 1931 | | 9 | Species | Taxom |
| Licnobelbidae (Grandjean, 1965) | | 6 | Species | Taxom |
| Licnodamaeidae (Grandjean, 1954) | | 26 | Species | Taxom |
| Liebstadiidae J. & P. Balogh, 1984 | | 26 | Species | Taxom |
| Limnesiidae Thor, 1900 | | 26 | Species | Taxom |
| Limnocharidae Grube, 1859 | | 3 | Species | Taxom |
| Limnozetidae Thor, 1937 | | 11 | Species | Taxom |
| Linotetranidae Baker & Prit..., 1953 | | 1 | Species | Taxom |
| Liodidae Grandjean, 1954 | Round fungus beetle | 4 | Species | Taxom |
| Listrophoridae Mégnin & Tro..., 1884 | | 40 | Species | Taxom |
| Lohmanniidae Berlese, 1916 | | 42 | Species | Taxom |
| Lordalychidae Grandjean, 1939 | | 2 | Species | Taxom |
| Machuellidae Balogh, 1983 | | 9 | Species | Taxom |
| Malaconothridae Berlese, 1916 | | 57 | Species | Taxom |
| Mesoplophoridae Ewing, 1917 | | 8 | Species | Taxom |
| Micreremidae Grandjean, 1954 | | 3 | Species | Taxom |
| Microdispidae Cross, 1965 | | 8 | Species | Taxom |
| Micropsammidae Coineau & Th..., 1983 | | 1 | Species | Taxom |
| Microtegeidae Balogh, 1972 | | 2 | Species | Taxom |
| Microtrombidiidae Womersley, 1936 | Micro velvet mites | 146 | Species | Taxom |
| Microzetidae Grandjean, 1936 | | 55 | Species | Taxom |
| Mideidae Thor, 1911 | | 1 | Species | Taxom |
| Mideopsidae Koenike, 1910 | | 25 | Species | Taxom |
| Mochlozetidae Grandjean, 1960 | | 11 | Species | Taxom |
| Momoniidae Viets, 1926 | | 6 | Species | Taxom |
| Mycobatidae Grandjean, 1954 | | 8 | Species | Taxom |
| Myobiidae Megnin, 1877 | | 57 | Species | Taxom |
| Myocoptidae Gunther, 1942 | | 20 | Species | Taxom |
| Nanhermanniidae Sellnick, 1928 | | 24 | Species | Taxom |
| Nanohystricidae Norton & Fua..., 2015 | | 1 | Species | Taxom |
| Nanorchestidae Luxton, 1984 | | 26 | Species | Taxom |
| Nasutiacaridae | | 1 | Species | Taxom |
| Nematalycidae Strenzke, 1954 | | 4 | Species | Taxom |
| Neoacaridae (Motas & Tana..., 1947) | | 1 | Species | Taxom |
| Neoliodidae (Sellnick, 1928) | | 13 | Species | Taxom |
| Neopygmephoridae Cross, 1965 | | 51 | Species | Taxom |
| Neothrombiidae Feider, 1959 | | 8 | Species | Taxom |
| Neotrombidiidae Feider, 1955 | | 2 | Species | Taxom |
| Niphocepheidae Travé, 1959 | | 4 | Species | Taxom |
| Nippobodidae Aoki, 1959 | | 2 | Species | Taxom |
| Nodocepheidae Piffl, 1972 | | 1 | Species | Taxom |
| Nosybeidae Mahunka, 1993 | | 1 | Species | Taxom |
| Nosybelbidae Mahunka, 1994 | | 10 | Species | Taxom |
| Nothridae Berlese, 1896 | | 30 | Species | Taxom |
| Oehserchestidae Kethley, 1977 | | 1 | Species | Taxom |
| Oppiidae Sellnick, 1937 | | 594 | Species | Taxom |
| Oribatellidae Jacot, 1925 | | 102 | Species | Taxom |
| Oribatidae | | 0 | Species | Taxom |
| Oribatulidae Thor, 1929 | | 196 | Species | Taxom |
| Oribellidae (Kunst, 1971) | | 50 | Species | Taxom |
| Oribotritiidae Grandjean, 1954 | | 51 | Species | Taxom |
| Oripodidae Jacot, 1925 | | 11 | Species | Taxom |
| Otocepheidae Balogh, 1961 | | 18 | Species | Taxom |
| Oxidae Viets, 1926 | | 20 | Species | Taxom |
| Palaeacaridae Grandjean, 1932 | | 7 | Species | Taxom |
| Parakalummidae Grandjean, 1936 | | 23 | Species | Taxom |
| Paratydeidae Baker, 1949 | | 10 | Species | Taxom |
| Parhypochthoniidae Grandjean, 1932 | | 7 | Species | Taxom |
| Passalozetidae Grandjean, 1954 | | 50 | Species | Taxom |
| Pediculochelidae Lavoipierre, 1946 | | 2 | Species | Taxom |
| Peloppiidae Balogh, 1943 | | 12 | Species | Taxom |
| Penthaleidae Oudemans, 1931 | Earth Mites | 23 | Species | Taxom |
| Penthalodidae Strandtmann, 1964 | | 8 | Species | Taxom |
| Perlohmanniidae Grandjean, 1954 | | 10 | Species | Taxom |
| Pezidae Harvey, 1990 | | 1 | Species | Taxom |
| Phenopelopidae Petrunkevitch, 1955 | | 78 | Species | Taxom |
| Pheroliodidae Paschoal, 1987 | | 2 | Species | Taxom |
| Phthiracaridae Perty, 1841 | | 266 | Species | Taxom |
| Phytoptidae Manson, 1970 | | 78 | Species | Taxom |
| Piersigiidae Oudemans, 1902 | | 3 | Species | Taxom |
| Pionidae Thor, 1900 | | 98 | Species | Taxom |
| Plasmobatidae Grandjean, 1961 | | 1 | Species | Taxom |
| Plateremaeidae Trägårdh, 1931 | | 16 | Species | Taxom |
| Platyameridae Balogh & Balogh, 1983 | | 1 | Species | Taxom |
| Pneumocoptidae Fain, 1957 | | 1 | Species | Taxom |
| Podapolipidae Husband, 1990 | | 45 | Species | Taxom |
| Podopterotegaeidae (Piffl, 1972) | | 2 | Species | Taxom |
| Polypterozetidae Grandjean, 1959 | | 1 | Species | Taxom |
| Pontarachnidae Koenike, 1910 | | 10 | Species | Taxom |
| Proctophyllodidae Trouessart &..., 1884 | | 87 | Species | Taxom |
| Protoplophoridae (Ewing, 1917) | | 15 | Species | Taxom |
| Protoribatidae J. & P. Balogh, 1984 | | 43 | Species | Taxom |
| Pseudocheylidae Oudemans, 1909 | | 8 | Species | Taxom |
| Pseudoppiidae (Mahunka, 1975) | | 3 | Species | Taxom |
| Psoralgidae Oudemans, 1908 | | 2 | Species | Taxom |
| Psorergatidae Womersley, 1941 | | 40 | Species | Taxom |
| Psoroptidae Hering, 1838 | Scab mites | 13 | Species | Taxom |
| Psoroptoididae Gaud, 1958 | | 8 | Species | Taxom |
| Pterolichidae Trouessart, 1899 | | 49 | Species | Taxom |
| Pteronyssidae Oudemans, 1941 | | 33 | Species | Taxom |
| Pterygosomatidae Womersley, 1941 | | 7 | Species | Taxom |
| Ptiloxenidae Gaud, 1982 | | 7 | Species | Taxom |
| Punctoribatidae Thor, 1937 | | 86 | Species | Taxom |
| Pyemotidae Newport, 1850 | | 21 | Species | Taxom |
| Pygmephoridae Krczal, 1964 | | 30 | Species | Taxom |
| Pyroglyphidae Cunliffe, 1958 | Dust mites | 13 | Species | Taxom |
| Quadroppiidae Balogh, 1983 | | 37 | Species | Taxom |
| Raphignathidae Kramer, 1877 | | 56 | Species | Taxom |
| Rhagidiidae Zacharda, 1980 | | 137 | Species | Taxom |
| Rosensteiniidae Cooreman, 1954 | | 3 | Species | Taxom |
| Rutripalpidae Sokolow, 1934 | | 1 | Species | Taxom |
| Sarcoptidae Megnin, 1877 | Itch mites | 27 | Species | Taxom |
| Scheloribatidae Jacot, 1935 | | 94 | Species | Taxom |
| Scutacaridae Paoli, 1911 | | 113 | Species | Taxom |
| Scutoverticidae Grandjean, 1954 | | 59 | Species | Taxom |
| Selenoribatidae Schuster, 1963 | | 4 | Species | Taxom |
| Siteroptidae Martin, 1978 | Siteroptid mites | 108 | Species | Taxom |
| Smarididae Kramer, 1878 | | 25 | Species | Taxom |
| Sperchontidae Thor, 1900 | | 43 | Species | Taxom |
| Sphaerochthoniidae Grandjean, 1947 | | 9 | Species | Taxom |
| Sphaerolichidae Berlese, 1913 | | 2 | Species | Taxom |
| Spinozetidae Balogh, 1972 | | 3 | Species | Taxom |
| Steganacaridae (Niedbała, 1986) | | 18 | Species | Taxom |
| Stigmaeidae Wood, 1967 | | 345 | Species | Taxom |
| Stigmocheylidae (Kethley, 1990) | | 2 | Species | Taxom |
| Strandtmanniidae M. Zacharda, 1979 | | 2 | Species | Taxom |
| Stygothrombiidae Thor, 1935 | | 9 | Species | Taxom |
| Suctobelbidae Jacot, 1938 | | 150 | Species | Taxom |
| Suidasiidae Hughes, 1948 | | 7 | Species | Taxom |
| Synichotritiidae Walker, 1965 | | 1 | Species | Taxom |
| Syringobiidae Trouessart, 1897 | | 39 | Species | Taxom |
| Syringophilidae Lavoipierre, 1953 | Quill mites | 155 | Species | Taxom |
| Tanaupodidae Thor, 1935 | | 16 | Species | Taxom |
| Tarsocheylidae Berlese, 1904 | | 6 | Species | Taxom |
| Tarsonemidae Kramer, 1877 | Tarsonemid mites | 286 | Species | Taxom |
| Tectocepheidae Grandjean, 1954 | | 19 | Species | Taxom |
| Tegeocranellidae P. Balogh, 1987 | | 2 | Species | Taxom |
| Tegoribatidae Grandjean, 1954 | | 24 | Species | Taxom |
| Teneriffiidae Thor, 1911 | | 12 | Species | Taxom |
| Tenuialidae Jacot, 1929 | | 11 | Species | Taxom |
| Tenuipalpidae Berlese, 1913 | False spider mites | 221 | Species | Taxom |
| Terpnacaridae Grandjean, 1939 | | 4 | Species | Taxom |
| Tetranychidae Donnadieu, 1875 | Spider mites | 358 | Species | Taxom |
| Teutoniidae Koenike, 1910 | | 3 | Species | Taxom |
| Thermacaridae Sokolow, 1927 | | 1 | Species | Taxom |
| Thyasidae (Koenike, 1892) | | 0 | Species | Taxom |
| Thyrisomidae Grandjean, 1953 | | 21 | Species | Taxom |
| Thysanocercidae Atyeo & Pete..., 1972 | | 1 | Species | Taxom |
| Tokunocepheidae Aoki, 1966 | | 1 | Species | Taxom |
| Torrenticolidae Thor, 1902 | Torrent Mites | 94 | Species | Taxom |
| Trhypochthoniidae Willmann, 1931 | | 34 | Species | Taxom |
| Triasacaridae | | 2 | Species | Taxom |
| Trichthoniidae (Lee, 1982) | | 1 | Species | Taxom |
| Triophtydeidae (André, 1980) | | 14 | Species | Taxom |
| Triophytydeidae | | 0 | Species | Taxom |
| Trizetidae Ewing, 1917 | | 1 | Species | Taxom |
| Trombellidae Thor, 1935 | | 10 | Species | Taxom |
| Trombiculidae Ewing, 1929 | Chigger mites | 699 | Species | Taxom |
| Trombidiidae Leach, 1815 | Beer Bahuti | 165 | Species | Taxom |
| Trouessartiidae Gaud, 1957 | | 23 | Species | Taxom |
| Turbinoptidae Fain, 1957 | | 4 | Species | Taxom |
| Tydeidae Kramer, 1877 | Tydeid mites | 277 | Species | Taxom |
| Unduloribatidae Kunst, 1971 | | 6 | Species | Taxom |
| Unguicheylidae Khaustov Vor..., 2023 | | 1 | Species | Taxom |
| Unionicolidae Oudemans, 1909 | | 41 | Species | Taxom |
| Wettinidae Cook, 1956 | | 1 | Species | Taxom |
| Winterschmidtiidae Oudemans, 1923 | | 71 | Species | Taxom |
| Xenillidae Woolley & Hi..., 1966 | | 38 | Species | Taxom |
| Xolalgidae Dubinin, 1953 | | 36 | Species | Taxom |
| Xylobatidae J. Balogh & ..., 1984 | | 1 | Species | Taxom |
| Zetomotrichidae Grandjean, 1934 | | 19 | Species | Taxom |
| Zetorchestidae Michael, 1898 | | 22 | Species | Taxom |