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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 Arhynchobdellida
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Family Cylicobdellidae
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Family Erpobdellidae
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Family Haemadipsidae
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Family Haemopidae
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Family Hirudinidae
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