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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 Cephalaspidea
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Family Retusidae
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Genus Retusa
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Species Retusa umbilicata
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Infraspecies Retusa umbilicata nitidula
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Infraspecies Retusa umbilicata umbilicata
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