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Eumetazoa (metazoans)
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Bilateria (bilaterally symmetrical animals)
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Protostomia (protostomes)
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Platyhelminthes (flatworms)
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Class Turbellaria
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Order Polycladida
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Family Plehniidae
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Genus Plehnia
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Species Plehnia arctica
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Species Plehnia caeca
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