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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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Crustacea (shrimps, crabs, lobsters, water fleas, and relatives)
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Class Maxillopoda
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Order Siphonostomatoida
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Family Pennellidae
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Genus Pennella
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Species Pennella balaenopterae
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Species Pennella costai
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Species Pennella crassicornis
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Species Pennella filosa
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Species Pennella hawaiiensis
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Species Pennella instructa
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Species Pennella remorae
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Species Pennella sagitta
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