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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 Haplotaxida
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Family Alluroididae
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Family Dorydrilidae
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Family Enchytraeidae
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Family Eudrilidae
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Family Glossoscolecidae
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Family Haplotaxidae
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Family Lumbricidae
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Family Megascolecidae
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Family Naididae
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Family Opistocystidae
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Family Phreodrilidae
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Family Sparganophilidae
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Family Tubificidae
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