def self.disjoint_taxon_name_classes
    self.parent.disjoint_taxon_name_classes + self.collect_to_s(
        TaxonNameClassification::Iczn::Unavailable::Suppressed,
        TaxonNameClassification::Iczn::Unavailable::Suppressed::OfficialIndexOfRejectedAndInvalidWorksInZoology,
        TaxonNameClassification::Iczn::Unavailable::Suppressed::NotInOfficialListOfAvailableNamesInZoology,