| Classe | Ordre | Famille |
| ARACHNIDA | Prostigmata Kramer, 1877 | Adamystidae Cunliffe, 1957 |
| | | Anystidae Oudemans, 1902 |
| | | Arrenuridae Thor, 1900 |
| | | Bdellidae Dugès, 1834 |
| | | Bdelloidea Hudson, 1884 |
| | | Caeculidae Berlese, 1883 |
| | | Calyptostomatidae Oudemans, 1923 |
| | | Camerobiidae Southcott, 1957 |
| | | Cheyletidae Leach, 1815 |
| | | Cocceupodidae Jesionowska, 2010 |
| | | Cunaxidae Thor, 1902 |
| | | Dolichocybidae Mahunka, 1970 |
| | | Ereynetidae Oudemans, 1931 |
| | | Eriophyidae Nalepa, 1898 |
| | | Erythracaridae Oudemans, 1936 |
| | | Erythraeidae Oudemans, 1902 |
| | | Eupodidae C.L. Koch, 1842 |
| | | Eylaidae Leach, 1815 |
| | | Halacaridae Murray, 1877 |
| | | Hydrachnidae Leach, 1815 |
| | | Hydrachnidiae |
| | | Hydrodromidae Viets, 1936 |
| | | Hydryphantidae Piersig, 1896 |
| | | Hygrobatidae Koch, 1842 |
| | | Johnstonianidae Newell, 1957 |
| | | Labidostommatidae Oudemans, 1906 |
| | | Lebertiidae Thor, 1900 |
| | | Limnesiidae Thor, 1900 |
| | | Limnocharidae Grube, 1859 |
| | | Microtrombidiidae Thor, 1935 |
| | | Myobiidae Mégnin, 1877 |
| | | Penthaleidae Oudemans, 1931 |
| | | Penthalodidae Thor, 1933 |
| | | Phytoptidae Murray, 1877 |
| | | Pionidae Thor, 1900 |
| | | Podothrombiidae Thor, 1935 |
| | | Pterygosomatidae Oudemans, 1910 |
| | | Pyemotidae Oudemans, 1937 |
| | | Pygmephoridae Cross, 1965 |
| | | Pygmephoroidea |
| | | Rhagidiidae Oudemans, 1922 |
| | | Scutacaridae Oudemans, 1916 |
| | | Smarididae Vitzthum, 1929 |
| | | Tanaupodidae Thor, 1935 |
| | | Tenuipalpidae Berlese, 1913 |
| | | Tetranychidae Donnadieu, 1875 |
| | | Triophtydeidae André, 1979 |
| | | Trombellidae Thor, 1935 |
| | | Trombiculidae Ewing, 1929 |
| | | Trombidiidae Leach, 1815 |
| | | Tydeidae Kramer, 1877 |
| | | Unionicolidae Oudemans, 1909 |
