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Eumetazoa (metazoans)
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Bilateria (bilaterally symmetrical animals)
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Protostomia (protostomes)
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Lophophorates (lophophorates)
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Order Cyclostomata
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Suborder Cancellata
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Family Calvetiidae
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Family Cytididae
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Family Horneridae
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Family Petaloporidae
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Family Pseudidmoneidae
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Family Stigmatoechidae
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