| Caseyidae Verhoeff, 1909 (Family) |
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| Opiona Chamberlin, 1951 (Genus) |
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| Opiona berryessae Gardner & Shelley, 1989 (Species) |
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| Opiona bifurcata Gardner & Shelley, 1989 (Species) |
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| Opiona casualis Gardner & Shelley, 1989 (Species) |
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| Opiona columbiana Chamberlin, 1951 (Species) |
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| Opiona communis Gardner & Shelley, 1989 (Species) |
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| Opiona confusa Gardner & Shelley, 1989 (Species) |
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| Opiona distincta Gardner & Shelley, 1989 (Species) |
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| Opiona exigua Gardner & Shelley, 1989 (Species) |
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| Opiona facetia Gardner & Shelley, 1989 (Species) |
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| Opiona fisheri Gardner & Shelley, 1989 (Species) |
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| Opiona goedeni Gardner & Shelley, 1989 (Species) |
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| Opiona hatchi Causey, 1954 (Species) |
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| Opiona scytonotoides Gardner & Shelley, 1989 (Species) |
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| Opiona siliquae Causey, 1963 (Species) |
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