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Eumetazoa (metazoans)
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Bilateria (bilaterally symmetrical animals)
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Protostomia (protostomes)
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Arthropoda (arthropods)
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Myriapoda (millipedes, centipedes, and relatives)
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Class Diplopoda
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Order Chordeumatida
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Family Caseyidae
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Genus Opiona
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Species Opiona berryessae
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Species Opiona bifurcata
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Species Opiona casualis
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Species Opiona columbiana
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Species Opiona communis
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Species Opiona confusa
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Species Opiona distincta
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Species Opiona exigua
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Species Opiona facetia
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Species Opiona fisheri
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Species Opiona goedeni
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Species Opiona scytonotoides
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Species Opiona siliquae
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