Threatened/Endangered Status Codes
List Title
Federal Endangered Species Act List
Description
List of threatened and endangered species defined by the US Fish and Wildlife Service recorded in the Federal Register under the Endangered Species Act.
Data Source
U.S. Fish and Wildlife Service. 2025. Listed U.S. Species Reported by the FWS Species Data Explorer. See: https://ecos.fws.gov/ecp/report/adhocDocumentation?catalogId=species&reportId=species
50
Not Listed
A
Unused - A
AD
Proposed Delisting
AE
Proposed Reclassification to Endangered
AT
Proposed Reclassification to Threatened
C
Candidate
A species under consideration for official listing for which there is sufficient information to support listing.
C2
Heritage Program Taxon of Concern
C4
Unused - C4
CA
Candidate - CA
D
Unused - D
D3A
Extinction
D3B
Original Data in Error - Taxonomic Revision
D3C
Delist, Other
DA
Original Data in Error - Act Amendment
DM
Recovery
Species that has been removed from the list due to recovery [and is in the monitoring period]
DNS
Original Data in Error - Not a listable entity
DO
Original Data in Error - Erroneous Data
DP
Original Data in Error - New Information Discovered
DR
Original Data in Error - Taxonomic Revision
E
Endangered
A species "in danger of extinction throughout all or a significant portion of its range."
E*
Endangered Genus
see E
EmE
Emergency Listing, Endangered
A temporary (240 days) listing for emergency purposes when species is at significant, immediate risk.
EmSAE
Emergency, Similarity of Appearance (Endangered)
EmSAT
Emergency, Similarity of Appearance (Threatened)
EmT
Emergency Listing, Threatened
A temporary (240 days) listing for emergency purposes when species is at significant, immediate risk.
EXPE
Experimental Population, Essential
experimental essential population. A species listed as experimental and essential
EXPEN
Experimental Population, Essential, Not Listed
EXPN
Experimental Population, Non-Essential
Experimental, nonessential populations of endangered species (e.g., red wolf) are treated as threatened species on public land, for consultation purposes, and as species proposed for listing on private land.
EXPNN
Experimental Population, Non-Essential, Not Listed
M
Monitored
NS
Error in entry
PE
Proposed Endangered
proposed endangered. Species proposed for official listing as endangered.
PEXPE
Proposed Experimental Population, Essential
proposed experimental population, essential. Species proposed for official listing as experimental and essential.
PEXPEN
Proposed Experimental Population, Essential, Not Listed
PEXPN
Proposed Experimental Population, Non-Essential
PEXPNN
Proposed Experimental Population, Non-Essential, Not Listed
PL
Proposed Listing
PSAE
Proposed Similarity of Appearance (Endangered)
see SAE
PSAT
Proposed Similarity of Appearance (Threatened)
see SAT
PT
Proposed Threatened
proposed threatened. Species proposed for official listing as threatened.
RT
Resolved Taxon
S
Unused - S
SAE
Similarity of Appearance (Endangered)
endangered due to similarity of appearance. A species that is endangered due to similarity of appearance with another listed species and is listed for its protection. Species listed as E(S/A) are not biologically endangered or threatened and are not subject to Section 7 consultation.
SAT
Similarity of Appearance (Threatened)
threatened due to similarity of appearance. A species that is threatened due to similarity of appearance with another listed species and is listed for its protection. Species listed as T(S/A) are not biologically endangered or threatened and are not subject to Section 7 consultation.
SC
Species of Concern
Species that have not been petitioned or been given E, T, or C status but have been identified as important to monitor.
SOC
Species of Concern - SOC
SU
Status Undefined
T
Threatened
A species "likely to become endangered within the foreseeable future throughout all or a significant portion of its range."
Unlist
Pre-Act Delisted Taxon
UR
Under Review
Species that have been petitioned for listing and for which a 90 day finding has not been published or for which a 90 day substantial has been published but a 12 Month finding have not yet been published in the Federal Register. Also includes species that are being reviewed through the candidate pro