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Eumetazoa (metazoans)
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Bilateria (bilaterally symmetrical animals)
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Protostomia (protostomes)
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Platyhelminthes (flatworms)
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Class Neoophora
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Order Dalyellioida
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Family Dalyellidae
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Genus Chonostomum
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Species Chonostomum crenulatum
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