| Arachnida (Class) |
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| Pseudoscorpionida De Geer, 1778 (Order) |
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| Garypidae (Family) |
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| Olpiidae (Family) |
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| Syarinidae Chamberlin, 1930 (Family) |
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| Tridenchthoniidae Balzan, 1892 (Family) |
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| Withiidae Chamberlin, 1931 (Family) |
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| Pseudoscorpionida Cheliferinea (Suborder) |
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| Atemnidae Chamberlin, 1931 (Family) |
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| Pseudoscorpionida Cheliferinea Cheiridoidea Chamberlin, 1931 (Superfamily) |
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| Cheiridiidae Hansen, 1895 (Family) |
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| Pseudoscorpionida Cheliferinea Cheliferoidea Risso in Chamberlin, 1931 (Superfamily) |
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| Cheliferidae Risso, 1826 (Family) |
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| Chernetidae Menge, 1855 (Family) |
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| Pseudoscorpionida Chthoniinea Beier, 1932 (Suborder) |
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| Pseudoscorpionida Chthoniinea Chthonioidea Daday, 1881 (Superfamily) |
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| Chthoniidae Daday, 1888 (Family) |
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| Pseudoscorpionida Neobisiinea Beier, 1932 (Suborder) |
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| Pseudoscorpionida Neobisiinea Neobisiodea Chamberlin, 1930 (Superfamily) |
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| Neobisiidae Chamberlin, 1930 (Family) |
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