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

@return [String]
The taxonomic rank of the most specific name in the scientificName
as it appears in the original record or the rank designator within the
verbatim original name itself. May incude abbreviations for example.

Example: "Agamospecies", "sub-lesus", "prole", "apomict", "nothogrex",
"sp.", "subsp.", "var."
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