Candidate Delisted Taxon, Amendment of the Act Delisted Taxon, Discovered Previously Unknown Additional Populations and/or Habitat Delisted Taxon, Extinct Delisted Taxon, Original Commercial Data Erroneous Delisted Taxon, Recovered Delisted Taxon, Taxonomic Revision (Improved Understanding) Endangered Endangered Genus Error in entry; not a legitimate taxon Experimental Population, Non-Essential Pre-Act Delisting (or clearance--removal from the Lists) Proposed Endangered Proposed Similarity of Appearance to a Threatened Taxon Proposed Threatened Resolved Taxon Similarity of Appearance to a Threatened Taxon Species of Concern Status Undefined Threatened Under Review in the Candidate or Petition Process