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."