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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 Physidae
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Genus Physa
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Species Physa columbiana
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Species Physa concolor
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Species Physa fontinalis
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Species Physa gyrina
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Species Physa heterostropha
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Species Physa hordacea
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Species Physa integra
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Species Physa jennessi
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Species Physa lordi
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Species Physa megalochlamys
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Species Physa natricina
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Species Physa nuttalli
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Species Physa propingua
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Species Physa pumilia
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Species Physa siberica
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Species Physa skinneri
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Species Physa vernalis
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