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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 Opisthopora
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Family Megascolecidae
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Genus Perionychella
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Species Perionychella egmonti
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Species Perionychella helophila
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Species Perionychella perionychopsis
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Species Perionychella shoeana
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