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parentNameUsage (http://rs.tdwg.org/dwc/terms/parentNameUsage)

@return [String]
The scientificName of the immediate higher-rank parent taxon (in a
classification). This name must match the name used in the row
representing the parent taxon. Using IDs (using parentNameUsage) is
preferred to this method.

Example: "Rubiaceae", "Gruiformes", "Testudinae"
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