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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 Mesostigmata
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Superfamily Rhodacaroidea
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Family Ologamasidae
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Genus Hydrogamasellus
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Species Hydrogamasellus antarcticus
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Species Hydrogamasellus antennatus
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Species Hydrogamasellus armatissimus
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Species Hydrogamasellus avium
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Species Hydrogamasellus brevipilus
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Species Hydrogamasellus brevispiritus
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Species Hydrogamasellus bullarmatus
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Species Hydrogamasellus calculus
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Species Hydrogamasellus cavei
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Species Hydrogamasellus cicatricosus
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Species Hydrogamasellus coleoptratus
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Species Hydrogamasellus conchatus
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Species Hydrogamasellus contingentis
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Species Hydrogamasellus crozetensis
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Species Hydrogamasellus gaussi
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Species Hydrogamasellus iaculi
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Species Hydrogamasellus lanceolatus
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Species Hydrogamasellus longopilus
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Species Hydrogamasellus microcrinis
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Species Hydrogamasellus multospinosus
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Species Hydrogamasellus nasutus
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Species Hydrogamasellus racovitzai
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Species Hydrogamasellus stipulae
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Species Hydrogamasellus striatus
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Species Hydrogamasellus testudinis
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Species Hydrogamasellus topali
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Species Hydrogamasellus ubatubaensis
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