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Eumetazoa (metazoans)
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Bilateria (bilaterally symmetrical animals)
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Protostomia (protostomes)
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Mollusca (clams, snails, squids, and relatives)
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Class Gastropoda
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Order Basommatophora
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Family Ancylidae
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Genus Ferrissia
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Species Ferrissia dalli
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Species Ferrissia fragilis
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Species Ferrissia hendersoni
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Species Ferrissia mcneili
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Species Ferrissia parallelus
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Species Ferrissia rivularis
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Species Ferrissia walkeri
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