| Arthropoda (Phylum) |
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| Arachnida (Class) |
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| Acari (Order) |
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| Acaridida (Order) |
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| Amblypygi (Order) |
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| Araneae (Order) |
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| Cheliferes Gervais, 1844 (Order) |
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| Chelonethi Thorell, 1883 (Order) |
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| Chelonethida Chamberlin, 1929 (Order) |
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| Chernetes Simon, 1879 (Order) |
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| Chernetidae Menge, 1855 (Order) |
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| Faux Scorpiones Latreille, 1817 (Order) |
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| Opiliones (Order) |
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| Palpigradi (Order) |
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| Prostigmata (Order) |
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| Pseudoscorpiones Latreille, 1825 (Order) |
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| Pseudoscorpionida Banks, 1895 (Order) |
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| Pseudoscorpionida De Geer, 1778 (Order) |
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| Pseudoscorpionidea Beier, 1932 (Order) |
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| Ricinulei (Order) |
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| Schizomida (Order) |
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| Scorpiones (Order) |
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| Solifugae (Order) |
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| Uropygi (Order) |
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| Arachnida Acari Leach, 1817 (Subclass) |
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| AcariIncertaesedis (Order) |
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| Sarcoptiformes Reuter, 1909 (Order) |
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| Arachnida Acari Acariformes Zakhvatkin, 1952 (Superorder) |
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| Acariformes (Order) |
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| Actinedida van der Hammen, 1968 (Order) |
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| Astigmata G. Canestrini, 1891 (Order) |
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| Cryptostigmata (Order) |
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| Oribatida Hammen, 1968 (Order) |
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| Oribatides Dug?s, 1839 (Order) |
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| Oribatoidea Banks, 1894 (Order) |
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| Arachnida Acari Parasitiformes Reuter, 1909 (Superorder) |
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| Holothyrida Thon, 1909 (Order) |
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| Ixodida Leach, 1815 (Order) |
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| Ixodides Leach, 1815 (Order) |
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| Mesostigmata G. Canestrini, 1891 (Order) |
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| Metastigmata (Order) |
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| Opilioacarida With, 1902 (Order) |
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