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Eumetazoa (metazoans)
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Bilateria (bilaterally symmetrical animals)
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Protostomia (protostomes)
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Gastrotricha (hairy back worms)
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Class Not assigned
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Order Macrodasyda
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Family Thaumastodermatidae
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Genus Acanthodasys
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Species Acanthodasys arcassonensis
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