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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 Hemiptera
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Superfamily Coccoidea
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Family Diaspididae
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Genus Chionaspis
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Chionaspis salicis
black willow bark louse
(Also: california willow scale; cottonwood scale; willow scale; willow scurfy scale)