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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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Chelicerata (spiders, mites, scorpions, and relatives)
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Class Arachnida
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Order Trombidiformes
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Family Hydrachnidae
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Genus Hydrachna
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Species Hydrachna baculoscutata
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Species Hydrachna canadensis
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Species Hydrachna conjecta
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Species Hydrachna crenulata
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Species Hydrachna cruenta
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Species Hydrachna geographica
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Species Hydrachna hesperia
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Species Hydrachna hungerfordi
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Species Hydrachna hutchinsoni
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Species Hydrachna leegei
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Species Hydrachna magniscutata
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Species Hydrachna marshallae
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Species Hydrachna microscutata
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Species Hydrachna miliaria
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Species Hydrachna mystomirabilis
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Species Hydrachna rotunda
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Species Hydrachna stipata
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