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Eumetazoa (metazoans)
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Bilateria (bilaterally symmetrical animals)
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Protostomia (protostomes)
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Annelida (segmented worms)
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Class Clitellata
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Order Rhynchobdellida
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Family Piscicolidae
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Genus Branchellion
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Species Branchellion borealis
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Species Branchellion lobata
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Species Branchellion ravenelii
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Species Branchellion torpedinis
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