| Arachnida (Class) |
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| Arachnida Acari Leach, 1817 (Subclass) |
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| Arachnida Acari Acariformes Zakhvatkin, 1952 (Superorder) |
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| Actinedida van der Hammen, 1968 (Order) |
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| Actinedida Anystina [van der Hammen, 1973] (Suborder) |
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| Actinedida Anystina Anystoidea Oudemans, 1902 (Superfamily) |
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| Adamystidae Cunliffe, 1957 (Family) |
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| Anystidae Oudemans, 1936 (Family) |
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| Pseudocheylidae Oudemans, 1909 (Family) |
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| Teneriffiidae Sig Thor, 1911 (Family) |
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| Actinedida Anystina Caeculoidea Berlese, 1883 (Superfamily) |
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| Caeculidae Berlese, 1883 (Family) |
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| Actinedida Anystina Paratydeoidea Baker, 1949 (Superfamily) |
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| Paratydeidae Baker, 1949 (Family) |
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| Actinedida Anystina Pomerantzioidea Baker, 1949 (Superfamily) |
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| Pomerantziidae Baker, 1949 (Family) |
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| PomerantzioideaIncertaesedis (Family) |
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| Actinedida Anystina Pterygosomatoidea Oudemans, 1910 (Superfamily) |
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| Pterygosomatidae Oudemans, 1910 (Family) |
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| Actinedida Eleutherengona Oudemans, 1909 (Suborder) |
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| Actinedida Eleutherengona ActinedinaIncertaesedis (Superfamily) |
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| Actinedida Eleutherengona Cheyletoidea Leach, 1815 (Superfamily) |
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| Cheyletidae Leach, 1815 (Family) |
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| Cloacaridae Camin, Moss, Oliver & Singer, 1967 (Family) |
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| Demodecidae Nicolet, 1855 (Family) |
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| Epimyodicinae Fain, Lukoschus & Rosmalen, 1982 (Family) |
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| Harpyrhynchidae Dubinin, 1957 (Family) |
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| Lobatinae Casto, 1977 (Family) |
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| Myobiidae Mégnin, 1877 (Family) |
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| Ophioptidae Southcott, 1956 (Family) |
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| Picobiinae D.E.Johnston, 1973 (Family) |
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| Psorergatidae Dubinin in Bregetova et al., 1955 (Family) |
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| Syringophilidae Lavoipierre, 1953 (Family) |
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| Actinedida Eleutherengona EleutherengonaIncertaesedis (Superfamily) |
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| Athyreacaridae E. E. Lindquist, M. Kaliszewski & G. Rack, 1990 (Family) |
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| Bembidiacaridae Khuastov, 2000 (Family) |
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| Crotalomorphidae Lindquist & Krantz, 2002 (Family) |
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| Actinedida Eleutherengona Eriophyoidea Nalepa, 1898 (Superfamily) |
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| Ashieldophyidae Mohanasundaram, 1985 (Family) |
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| Boczekellinae Farkas, 1969 (Family) |
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| Diptilomiopidae Keifer, 1944 (Family) |
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| Eriophyidae Nalepa, 1898 (Family) |
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| EriophyoideaIncertaesedis (Family) |
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| Nalepellidae Roivainen, 1953 (Family) |
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| Pentasetacidae Shevchenko, Bagnyuk & Sukhareva, 1991 (Family) |
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| Phytoptidae Murray, 1877 (Family) |
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| Sierraphytoptidae Keifer, 1944 (Family) |
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| Trisetacoidea Shevchenko, 1968 (Family) |
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| Actinedida Eleutherengona Heterocheyloidea Trägårdh, 1950 (Superfamily) |
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| Heterocheylidae Trägårdh, 1950 (Family) |
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| Actinedida Eleutherengona Pyemotoidea Oudemans, 1937 (Superfamily) |
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| Acarophenacidae Cross, 1965 (Family) |
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| Caraboacaridae Mahunka, 1970 (Family) |
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| Dolichocybidae Mahunka, 1970 (Family) |
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| Pediculasterinae Mahunka, 1970 (Family) |
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| Pyemotidae Oudemans, 1937 (Family) |
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| Siteroptidae Mahunka, 1970 (Family) |
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| Trochometrinae Mahunka, 1970 (Family) |
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| Actinedida Eleutherengona Pygmephoroidea (Superfamily) |
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| Microdispidae Cross, 1965 (Family) |
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| Pygmephoridae Cross, 1965 (Family) |
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| PygmephoroideaIncertaesedis (Family) |
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| Scutacaridae Oudemans, 1916 (Family) |
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| Actinedida Eleutherengona Raphignathoidea Kramer, 1877 (Superfamily) |
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| Barbutiidae Robaux, 1975 (Family) |
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| Caligonellidae (Family) |
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| Camerobiidae Southcott, 1957 (Family) |
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| Cryptognathidae Oudemans, 1902 (Family) |
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| Dasythyreidae Walter & Gerson, 1998 (Family) |
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| Eupalopsellidae Willmann, 1952 (Family) |
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| Homocaligidae Wood, 1969 (Family) |
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| Mecognathidae Gerson & Walter, 1998 (Family) |
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| Raphignathidae Kramer, 1877 (Family) |
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| Stigmaeidae Oudemans, 1931 (Family) |
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| Xenocaligonellidae Gonzalez, 1978 (Family) |
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| Xenocaligonellididae Gonzalez, 1978 (Family) |
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| Actinedida Eleutherengona Tarsocheyloidea Atyeo & Baker, 1964 (Superfamily) |
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| Tarsocheylidae Atyeo & Baker, 1964 (Family) |
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| Actinedida Eleutherengona Tarsonemoidea G.Canestrini & Fanzago, 1877 (Superfamily) |
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| Podapolipidae Ewing, 1922 (Family) |
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| Tarsonemidae Canestrini & Fanzago, 1877 (Family) |
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| Actinedida Eleutherengona Tetranychoidea Donnadieu, 1875 (Superfamily) |
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| Allochaetophoridae Reck, 1959 (Family) |
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| Aponychinae Rimando, 1966 (Family) |
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| Atrichoproctinae Flechtmann, 1968 (Family) |
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| Colopalpini Mitrofanov, 1973 (Family) |
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| Linotetranidae Baker & Pritchard, 1953 (Family) |
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| Neophyllobiidae Southcott, 1957 (Family) |
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| Petrobiini Reck (Family) |
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| Pseudoleptidae Oudemans, 1928 (Family) |
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| Tenuipalpidae Berlese, 1913 (Family) |
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| Tenuipalpidini Pritchard, 1973 (Family) |
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| Tenuipalpoidinae Pritchard & Baker, 1955 (Family) |
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| Tetranychidae Donnadieu, 1876 (Family) |
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| TetranychoideaIncertaesedis (Family) |
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| Tuckerellidae Baker & Pritchard, 1953 (Family) |
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| Actinedida Endeostigmata Grandjean, 1937 (Suborder) |
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| Alicorhagiidae Grandjean, 1939 (Family) |
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| Actinedida Endeostigmata Bimichaeloidea (Superfamily) |
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| Bimichaeliidae Womersley, 1944 (Family) |
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| Grandjeanicidae Kethley, 1977 (Family) |
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| Lordalychidae Grandjean, 1939 (Family) |
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| Micropsammidae Y. Coineau & P. Theron, 1983 (Family) |
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| Nanorchestidae Grandjean, 1937 (Family) |
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| Oehserchestidae Kethley, 1977 (Family) |
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| Terpnacaridae Grandjean, 1939 (Family) |
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| Actinedida Endeostigmatides (Suborder) |
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| Actinedida Endostigmata (Suborder) |
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| Actinedida Eupodina (Suborder) |
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| Actinedida Eupodina Bdelloidea Dug?s, 1834 (Superfamily) |
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| Bdellidae Dug?s, 1834 (Family) |
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| Cunaxidae Sig Thor, 1902 (Family) |
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| Actinedida Eupodina Eupodoidea C.L.Koch, 1842 (Superfamily) |
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| Benoinyssinae Fain, 1958 (Family) |
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| Eriorhynchidae Qin & Halliday, 1997 (Family) |
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| Eupodidae C.L.Koch, 1842 (Family) |
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| Pentapalpidae Olivier & Theron, 2000 (Family) |
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| Penthaleidae Oudemans, 1931 (Family) |
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| Penthalodidae Sig Thor, 1933 (Family) |
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| Proterorhagiidae E.E. Lindquist & J.G. Palacios-Vargas, 1991 (Family) |
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| Rhagidiidae Oudemans, 1922 (Family) |
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| Strandtmanniidae M. Zacharda, 1979 (Family) |
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| Actinedida Eupodina Halacaroidea Murray, 1877 (Superfamily) |
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| Halacaridae Murray, 1877 (Family) |
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| Halcaridae (Family) |
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| Pezidae M.S. Harvey, 1990 (Family) |
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| Actinedida Eupodina Nematalycoidea Strenke, 1954 (Superfamily) |
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| Nematalycidae Strenke, 1954 (Family) |
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| Proteonematalycidae J. Kethley, 1989 (Family) |
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| Actinedida Eupodina Tydeoidea Kramer, 1877 (Superfamily) |
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| Ereynetidae Oudemans, 1931 (Family) |
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| Iolinidae A.E. Pritchard, 1956 (Family) |
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| Tydeidae Kramer, 1877 (Family) |
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| Actinedida Labidostommatina (Suborder) |
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| Actinedida Labidostommatina Labidostommatoidea Oudemans, 1906 (Superfamily) |
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| Labidostommatidae Oudemans, 1906 (Family) |
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| Actinedida Parasitengona Oudemans, 1909 (Suborder) |
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| Actinedida Parasitengona Amphotrombioidea Zhang, 1998 (Superfamily) |
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| Amphotrombiidae Zhang, 1998 (Family) |
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| Actinedida Parasitengona Arrenuroidea Sig Thor, 1900 (Superfamily) |
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| Acalyptonotidae Walter, 1911 (Family) |
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| Amoenacaridae Smith & Cook, 1997 (Family) |
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| Arenohydracaridae Cook, 1974 (Family) |
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| Arrenuridae Sig Thor, 1900 (Family) |
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| Arrhenurellinae Koenike, 1909 (Family) |
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| Athienemanniidae Viets, 1922 (Family) |
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| Bogatiidae Motas & Tanasachi, 1948 (Family) |
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| Chappuisididae Motas & Tanasachi, 1946 (Family) |
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| Gretacaridae Viets, 1978 (Family) |
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| Harpagopalpidae Viets, 1924 (Family) |
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| Hungarohydracaridae Motas & Tanasachi, 1959 (Family) |
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| Kantacaridae Imamura, 1959 (Family) |
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| Krendowskiidae Viets, 1929 (Family) |
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| Laversiidae Cook, 1955 (Family) |
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| Mideidae Sig Thor, 1911 (Family) |
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| Mideopsidae Koenike, 1910 (Family) |
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| Mixdeinae Orghidan & Gruia, 1980 (Family) |
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| Momoniidae Viets, 1926 (Family) |
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| Neoacaridae Motas & Tanasachi, 1947 (Family) |
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| Nipponacaridae Imamura, 1959 (Family) |
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| Uchidastygacaridae Imamura, 1956 (Family) |
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| Ungarohydracaridae (Family) |
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| Actinedida Parasitengona Arrhenuroidea Oudemans, 1902 (Superfamily) |
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| Actinedida Parasitengona Calyptostomatoidea Oudemans, 1923 (Superfamily) |
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| Calyptostomatidae Oudemans, 1923 (Family) |
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| Actinedida Parasitengona Erythraeoidea Robineau-Desvoidy, 1828 (Superfamily) |
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| Actinedida Parasitengona Erythreoidea Robineau-Desvoidy, 1828 (Superfamily) |
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| Balaustiinae Southcott, 1957 (Family) |
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| Discolopheae Kishida, 1939 (Family) |
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| Erythraeidae Oudemans, 1902 (Family) |
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| Erythreidae Robineau-Desvoidy, 1828 (Family) |
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| Hirstiosomatinae Southcott (Family) |
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| Leptinae Southcott, 1957 (Family) |
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| Smarididae Kramer, 1878 (Family) |
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| Sphaerolophinae (Family) |
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| Actinedida Parasitengona Eylaoidea Leach, 1815 (Superfamily) |
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| Apheviderulicidae Gerecke, Smith & Cook, 1999 (Family) |
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| Eylaidae Leach, 1815 (Family) |
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| Limnocharidae Grube, 1859 (Family) |
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| Piersigiidae Oudemans, 1902 (Family) |
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| Actinedida Parasitengona Hydrachnoidea Leach, 1815 (Superfamily) |
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| Hydrachnidae Leach, 1815 (Family) |
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| Hydrachninae Piersig, 1896 (Family) |
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| Actinedida Parasitengona Hydrovolzioidea Sig Thor, 1905 (Superfamily) |
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| Hydrovolziidae Sig Thor, 1905 (Family) |
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| Polyxohalacaridae Motas, 1972 (Family) |
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| Actinedida Parasitengona Hydryphantoidea Sig Thor, 1900 (Superfamily) |
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| Ctenothyadidae Lundblad, 1936 (Family) |
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| Diplodontidae Lundblad, 1927 (Family) |
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| Eupatrellidae Viets, 1935 (Family) |
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| Hydrodromidae Viets, 1936 (Family) |
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| Hydryphantidae Piersig, 1896 (Family) |
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| Protziidae Viets, 1926 (Family) |
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| Rhynchohydracaridae Lundblad, 1936 (Family) |
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| Teratothyadidae Viets, 1929 (Family) |
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| Thermacaridae Sokolow, 1927 (Family) |
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| Actinedida Parasitengona Hygrobatoidea C.L.Koch, 1842 (Superfamily) |
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| Astacocrotonidae Sig Thor, 1927 (Family) |
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| Atracidae Thor, 1900 (Family) |
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| Aturidae Sig Thor, 1900 (Family) |
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| Azugofeltriinae Motas & Tanasachi, 1948 (Family) |
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| Curvipedidae Sig Thor, 1900 (Family) |
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| Feltriidae Viets, 1926 (Family) |
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| Ferradasiidae D. R. Cook, 1980 (Family) |
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| Foreliidae Sig Thor, 1923 (Family) |
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| Hydrochoreutidae Viets, 1942 (Family) |
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| Hygrobatidae C.L.Koch, 1842 (Family) |
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| Limnesiidae Sig Thor, 1900 (Family) |
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| Ljaniidae Sig Thor, 1929 (Family) |
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| Nautarachnidae Walter, 1925 (Family) |
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| Omartacaridae Cook, 1963 (Family) |
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| Pionidae Sig Thor, 1900 (Family) |
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| Pontarachnidae Koenike, 1910 (Family) |
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| Unionicolidae Oudemans, 1909 (Family) |
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| Wettinidae Cook, 1956 (Family) |
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| Actinedida Parasitengona Lebertioidea Sig Thor, 1900 (Superfamily) |
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| Acucapitidae Wiles, 1996 (Family) |
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| Anisitsiellidae Koenike, 1910 (Family) |
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| Lebertiidae Sig Thor, 1900 (Family) |
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| Oxidae Viets, 1926 (Family) |
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| Rutripalpidae Sokolow, 1834 (Family) |
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| Sperchonidae (Family) |
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| Sperchontidae Sig Thor, 1900 (Family) |
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| Stygotoniidae D. R. Cook, 1992 (Family) |
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| Teutonidae Koenike, 1910 (Family) |
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| Torrenticolidae Piersig, 1902 (Family) |
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| Actinedida Parasitengona Stygothrombidioidea Sig Thor, 1935 (Superfamily) |
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| Actinedida Parasitengona Stygothrombioidea Sig Thor, 1935 (Superfamily) |
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| Stygothrombiidae Sig Thor, 1935 (Family) |
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| Actinedida Parasitengona Trombidioidea Leach, 1815 (Superfamily) |
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| Audyanidae Southcott, 1987 (Family) |
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| Charadracarinae Newell, 1960 (Family) |
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| Chyzeriidae Womersley, 1954 (Family) |
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| Gahrliepiinae Womersley, 1952 (Family) |
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| Georgiinae Vercammen-Grandjean, 1973 (Family) |
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| Intermedialiini Wen, 1984 (Family) |
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| Johnstonianidae Sig Thor, 1935 (Family) |
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| Leeuwenhoekiidae Womersley, 1944 (Family) |
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| Leeuwenhoekinae (Family) |
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| Lesseniinae Newell, 1957 (Family) |
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| Neothrombiidae Feider, 1955 (Family) |
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| Neotrombidiidae Feider, 1959 (Family) |
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| Perumaroptinae Haitlinger, 1999 (Family) |
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| Polydiscinae Vercammen-Grandjean, 1972 (Family) |
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| Ralphaudyninae Southcott, 1987 (Family) |
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| Tetrathrombiinae Southcott, 1987 (Family) |
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| Thrombellidae (Family) |
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| Thrombidiidae (Family) |
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| Trombellidae Leach, 1815 (Family) |
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| Trombiculidae Ewing, 1929 (Family) |
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| Trombidides Leach, 1815 (Family) |
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| Trombidiidae Leach, 1815 (Family) |
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| TrombidioideaIncertaesedis (Family) |
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| Vatacaridae Southcott, 1957 (Family) |
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| Walchiidae Ewing, 1946 (Family) |
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| Whartoniini Vercammen-Grandjean, 1968 (Family) |
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| Yurebillidae Southcott, 1996 (Family) |
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| Actinedida Promata (Suborder) |
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| Actinedida Promatides (Suborder) |
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| Actinedida Sphaerolichina (Suborder) |
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| Actinedida Sphaerolichina Sphaerolichidea (Superfamily) |
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| Sphaerolichidae (Family) |
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