| Arachnida (Class) |
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| Opiliones (Order) |
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| Opiliones Cyphophthalmi Simon, 1879 (Suborder) |
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| Sironidae Simon, 1879 (Family) |
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| Opiliones Cyphophthalmi Temperophthalmi Shear, 1980 (Infraorder) |
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| Opiliones Cyphophthalmi Temperophthalmi Sironoidea Simon, 1879 (Superfamily) |
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| Pettalidae Shear, 1980 (Family) |
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| Troglosironidae W. A. Shear, 1993 (Family) |
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| Opiliones Cyphophthalmi Tropicophthalmi Shear, 1980 (Infraorder) |
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| Opiliones Cyphophthalmi Tropicophthalmi Ogoveoidea Shear, 1980 (Superfamily) |
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| Neogoveidae Shear, 1980 (Family) |
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| Ogoveidae Shear, 1980 (Family) |
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| Opiliones Cyphophthalmi Tropicophthalmi Stylocelloidea Hansen & Sørensen, 1904 (Superfamily) |
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| Stylocellidae Hansen & Sørensen, 1904 (Family) |
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| Opiliones Dyspnoi Hansen & Sørensen, 1904 (Suborder) |
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| Opiliones Dyspnoi Ischyropsalidoidea Simon, 1879 (Superfamily) |
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| Ceratolasmatidae Shear, 1986 (Family) |
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| Ischyropsalididae Simon, 1879 (Family) |
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| Sabaconidae Dresco, 1970 (Family) |
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| Opiliones Dyspnoi Nemastomatoidea Simon, 1872 (Superfamily) |
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| Nemastomatidae Simon, 1872 (Family) |
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| Nemastomoididae Petrunkevitch, 1955 (Family) |
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| Nipponopsalididae Martens, 1976 (Family) |
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| Opiliones Dyspnoi Troguloidea Sundevall, 1833 (Superfamily) |
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| Eotrogulidae Petrunkevitch, 1955 (Family) |
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| Trogulidae Sundevall, 1833 (Family) |
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| Opiliones Eupnoi Hansen & Sørensen, 1904 (Suborder) |
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| Opiliones Eupnoi Caddoidea Banks, 1892 (Superfamily) |
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| Caddidae Banks, 1892 (Family) |
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| Opiliones Eupnoi Phalangioidea Latreille, 1802 (Superfamily) |
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| Incertaesedis (Family) |
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| Monoscutidae Forster, 1948 (Family) |
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| Neopilionidae Lawrence, 1931 (Family) |
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| Sclerosomatidae Simon, 1879 (Family) |
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| Stygophalangiidae Oudemans (Family) |
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| Opiliones Incertaesedis (Suborder) |
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| Opiliones Incertaesedis Incertaesedis (Superfamily) |
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| Opiliones Laniatores Thorell, 1876 (Suborder) |
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| Opiliones Laniatores Gonyleptoidea Silhavy, 1961 (Superfamily) |
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| Opiliones Laniatores Traviunioidea Kratochvil, 1958 (Superfamily) |
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| Erebomastridae Briggs, 1969 (Family) |
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| Traviuniidae Absolon & Kratochvil, 1932 (Family) |
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| Opiliones Laniatores Grassatores Kury in Giribet, Edgecombe, Wheeler & Babbitt, 2002 (Infraorder) |
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| Opiliones Laniatores Grassatores Biantoidea Thorell, 1889 (Superfamily) |
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| Biantidae Thorell, 1889 (Family) |
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| Escadabiidae Kury & Pérez, 2003: 103 (Family) |
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| Minuidae Sørensen, 1932 (Family) |
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| Podoctidae Roewer, 1912 (Family) |
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| Samoidae Sørensen in L.Koch, 1886 (Family) |
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| Stygnommatidae Roewer, 1923 (Family) |
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| Opiliones Laniatores Grassatores Epedanoidea Sørensen in L.Koch, 1886 (Superfamily) |
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| Epedanidae Sørensen in L.Koch, 1886 (Family) |
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| Opiliones Laniatores Grassatores Gonyleptoidea Sundevall, 1833 (Superfamily) |
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| Agoristenidae ilhavý, 1973 (Family) |
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| Assamiidae Sørensen, 1884 (Family) |
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| Cosmetidae C.L.Koch, 1839 (Family) |
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| Cranaidae Roewer, 1913 (Family) |
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| Gonyleptidae Sundevall, 1833 (Family) |
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| Manaosbiidae Roewer, 1943 (Family) |
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| Stygnidae Simon, 1879a (Family) |
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| Stygnopsidae Sørensen, 1932 (Family) |
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| Trionyxellidae Roewer, 1912 (Family) |
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| Opiliones Laniatores Grassatores Incertaesedis (Superfamily) |
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| Opiliones Laniatores Grassatores Phalangodoidea Simon, 1879 (Superfamily) |
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| Oncopodidae Thorell, 1876 (Family) |
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| Phalangodidae Simon, 1879 (Family) |
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| Pyramidopidae Starega (Family) |
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| Opiliones Laniatores Grassatores Zalmoxoidea Sørensen in L.Koch, 1886 (Superfamily) |
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| Guasiniidae González-Sponga, 1997a (Family) |
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| Icaleptidae Kury & Pérez, 2002 (Family) |
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| Insertaesedis (Family) |
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| Zalmoxioidae Sørensen in L.Koch, 1886 (Family) |
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| Opiliones Laniatores Insidiatores Loman, 1900 (Infraorder) |
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| Opiliones Laniatores Insidiatores Epedanoidea Sørensen in L.Koch, 1886 (Superfamily) |
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| Opiliones Laniatores Insidiatores Gonyleptoidea Sundevall, 1833 (Superfamily) |
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| Opiliones Laniatores Insidiatores Travunioidea Absolon & Kratochvíl, 1932 (Superfamily) |
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| Cladonychiidae Hadi, 1935 (Family) |
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| Pentanychidae Briggs, 1971 (Family) |
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| Synthetonychidae Forster, 1954 (Family) |
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| Travuniidae Absolon & Kratochvíl, 1932c (Family) |
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| Triaenonychidae Sørensen in L.Koch, 1886 (Family) |
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| Opiliones Laniatores Insidiatores Zalmoxoidea Sørensen in L.Koch, 1886 (Superfamily) |
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| Opiliones Palpatores Thorell, 1876 (Suborder) |
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| Opiliones Palpatores Ischyropsalidoidea Simon, 1879 (Superfamily) |
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| Ischyropsalidae Simon, 1879 (Family) |
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| Sabaconidae Dresco, 1970 (Family) |
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| Opiliones Palpatores Phalangioidea Sundevall, 1833 (Superfamily) |
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| Phalangiidae Latreille, 1802 (Family) |
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| Opiliones Palpatores Troguloidea Sundevall, 1833 (Superfamily) |
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| Dicranolasmatidae Simon, 1879 (Family) |
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| Nemastomatidae Simon, 1879 (Family) |
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| Nipponopsalididae (Family) |
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| Trogulidae Simon, 1872 (Family) |
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