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  Conservation Status Designations.
   
  |   Taylor et al. (1996)   |     Global Ranks     |      U.S. Federal Ranks   |    
 
   
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  Conservation Status as Defined by Taylor et. al. (1996)
   
 
E ENDANGERED
a species or subspecies in danger of extinction throughout all or a significant portion of its range.
E* ENDANGERED, POSSIBLY EXTINCT
a species or subspecies in danger of extinction throughout all or a significant portion of its range, and the taxon is possibly extinct.
T THREATENED
a species or subspecies likely to become endangered throughout all or a significant portion of its range.
SC SPECIAL CONCERN
a species or subspecies that may become endangered or threatened by relatively minor disturbances to its habitat and deserves careful monitoring of its abundance and distribution.
CS CURRENTLY STABLE
a species or subspecies whose distribution is widespread and stable and is not in need of immediate conservation management actions.
   
 
 
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Table of Global Rank Designations
Definition of Conservation Status Ranks

GX PRESUMED EXTINCT
not located despite intensive searches
GH POSSIBLY EXTINCT
of historical occurrence; still some hope of rediscovery
G1 CRITICALLY IMPERILED
typically 5 or fewer occurrences or 1,000 or fewer individuals
G2 IMPERILED
typically 6 to 20 occurrences or 1,000 to 3,000 individuals
G3 VULNERABLE
rare; typically 21 to 100 occurrences or 3,000 to 10,000 individuals
G4 APPARENTLY SECURE
uncommon but not rare; some cause for long-term concern; usually more than 100 occurrences and 10,000 individuals
G5 SECURE
common; widespread and abundant
 Note: "G" refers to global, or range-wide status. National (N) and State (S) status ranks also are assessed.
   
 
 
       
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  U.S. Federal Status Designations and Definitions
   
 
Abbreviation U.S. Federal (USESA) Status

LE 

LISTED ENDANGERED

LT

LISTED THREATENED

PE

PROPOSED ENDANGERED

PT

PROPOSED THREATENED

C

CANDIDATE FOR LISTING

PDL

PROPOSED FOR DELISTING

E(S/A) or T(S/A)

LISTED ENDANGERED OR THREATENED BECAUSE OF SIMILARITY OF APPEARANCE

XE

ESSENTIAL EXPERIMENTAL POPULATION

XN

EXPERIMENTAL NONESSENTIAL POPULATION

Combination values 

The taxon has one status currently, but a more recent proposal has been made to change that status with no final action yet published. For example, LE-PDL indicates that the species is currently listed as endangered, but has been proposed for delisting.
Values in parentheses The taxon itself is not named in the Federal Register as having federal status; however, it does have federal status as a result of its taxonomic relationship to a named entity. For example, if a species is federally listed with endangered status, then by default, all of its recognized subspecies also have endangered status. The subspecies in this example would have the value "(LE)" under U.S. Federal Status. Likewise, if all of a species' infraspecific taxa (worldwide) have the same federal status, then that status appears in the record for the "full" species as well. In this case, if the taxon at the species level is not mentioned in the Federal Register, the status appears in parentheses in that record.
Combination values in parentheses The taxon itself is not named in the Federal Register as having official federal status; however, all of its infraspecific taxa (worldwide) do have official status. The statuses shown in parentheses indicate the statuses that apply to infraspecific taxa or populations within this taxon.
(PS) Indicates "partial status" - status in only a portion of the species' range. Typically indicated in a "full" species record where an infraspecific taxon or population has federal status, but the entire species does not.
Null value
(NA)
Usually indicates that the taxon does not have any federal status. However, because of potential lag time between publication in the Federal Register and entry in the Central Databases and refresh of this website, some taxa may have a status which does not yet appear.
   

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Last Updated:  08 January 2019
James W. Fetzner Jr.