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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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Order Coleoptera
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Superfamily Staphylinoidea
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Genus Hydraena
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Species Hydraena americana
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Species Hydraena ancylis
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Species Hydraena angulicollis
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Species Hydraena appalachicola
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Species Hydraena arenicola
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Species Hydraena arizonica
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Species Hydraena atlantica
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Species Hydraena bituberculata
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Species Hydraena dinosaurophila
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Species Hydraena leechi
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Species Hydraena marginicollis
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Species Hydraena needhami
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Species Hydraena niger
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Species Hydraena nigra
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Species Hydraena occidentalis
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Species Hydraena ozarkensis
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Species Hydraena pacifica
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Species Hydraena pennsylvanica
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Species Hydraena petila
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Species Hydraena pulsatrix
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Species Hydraena punctata
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Species Hydraena spangleri
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Species Hydraena tuolumne
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Species Hydraena vandykei
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Species Hydraena youngi
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