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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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Brachiopoda (lamp-shells)
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Class Rhynchonellata
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Order Terebratulida
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Family Frenulinidae
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Genus Frenulina
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Species Frenulina cruenta
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Species Frenulina mauiensis
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Species Frenulina sanguinolenta
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