GRank: Priority ranking (1 to 5) based on the number of occurrences throughout the entire range of the element.
G1 Critically Imperiled: Critically imperiled globally because of extreme rarity or because of some factor(s) making it especially vulnerable to extinction. Typically 5 or fewer occurrences* or very few remaining individuals (<1,000) or acres (<2,000) or linear miles (<10).
G2 Imperiled: Imperiled globally because of rarity or because of some factor(s) making it very vulnerable to extinction or elimination. Typically 6 to 20 occurrences* or few remaining individuals (1,000 to 3,000) or acres (2,000 to 10,000) or linear miles (10 to 50).
G3 Vulnerable: Vulnerable globally either because very rare and local throughout its range, found only in a restricted range (even if abundant at some locations), or because of other factors making it vulnerable to extinction or elimination. Typically 21 to 100 occurrences* or between 3,000 and 10,000 individuals.
G4 Apparently Secure: Uncommon but not rare (although it may be in parts of its range, particularly on the periphery), and usually widespread. Apparently not vulnerable in most of its range, but possibly cause for long-term concern. Typically more than 100 occurrences* and more than 10,000 individuals.
G5 Secure: Common, widespread, and abundant (although it may be rare in parts of its range, particularly on the periphery). Not vulnerable in most of its range. Typically with considerably more than 100 occurrences* and more than 10,000 individuals.
GH Possibly Extinct (species): Known from historical occurrences*, but may nevertheless still be extant; further searching needed.
GX Presumed Extinct (species): Believed to be extinct throughout its range. Not located despite intensive searches of historical sites and other appropriate habitat, and virtually no likelihood that it will be rediscovered.
Variant Global Ranks
G#G# Range Rank: A numeric range rank (e.g., G2G3) is used to indicate the range of uncertainty about the exact status of a taxon. Ranges cannot skip more than one rank (e.g., GU should be used rather than G1G4).
GU Unrankable: Currently unrankable due to lack of information or due to substantially conflicting information about status or trends. NOTE: Whenever possible, the most likely rank is assigned and the question mark qualifier is added (e.g., G2?) to express uncertainty, or a range rank (e.g., G2G3) is used to delineate the limits (range) of uncertainty.
GNR The rank is not yet assigned (NR-not ranked), and is applied when the state rank is SNR (former state rank S? = Srank not yet assessed). GNA Conservation status rank is not applicable to the element at the global level. Includes Hybrids (HYB), Invasives, species of "Domestic origin" or "Cultural" communities, and communities that have been "Modified/managed". These pseudo ranks and all other qualifiers or pseudo ranks are now indicated through the use of new fields in the Distribution Data grid and Distribution Comment field in the Tracker database.
Global Rank Qualifiers
? Inexact Numeric Rank: Denotes inexact numeric rank. (The ? is not used in combination with range ranks).
Q Questionable Taxonomy that may reduce conservation priority: Distinctiveness of this entity as a taxon at the current level is questionable; resolution of this uncertainty may result in change from a species to a subspecies or hybrid, or inclusion of this taxon in another taxon, with the resulting Element having a lower-priority (numerically higher) conservation status rank.
C Captive or Cultivated Only (species): Taxon at present is extant only in captivity or cultivation, or as a reintroduced population not yet established.
Infraspecific Taxon Ranks
T# Infraspecific Taxon (trinomial): The status of infraspecific taxa (subspecies or varieties) are indicated by a “T-rank” following the species’ global rank. Rules for assigning T-ranks follow the same principles outlined above. For example, the global rank of a critically imperiled subspecies of an otherwise widespread and common species would be G5T1. A T subrank cannot imply the subspecies or variety is more abundant than the species, for example, a G1T2 subrank should not occur. A vertebrate animal population (e.g., listed under the U.S. Endangered Species Act or assigned candidate status) may be tracked as infraspecific taxon and given a T rank; in such cases a Q is used after the T-rank to denote the taxon’s informal taxonomic status.
*The term occurrences refers specifically to element occurrences
Subnational Heritage Status Rank Definitions (SRank)
The term subnational [or State Rank as commonly referred to in AZ] indicates jurisdictions at the state or provincial level (e.g., California, Navajo Nation, British Columbia).
S1 Critically Imperiled: Critically imperiled in the subnation because of extreme rarity or because of some factor(s) making it especially vulnerable to extirpation from the subnation. Typically 5 or fewer occurrences* or very few remaining individuals (<1,000).
S2 Imperiled: Imperiled in the subnation because of rarity or because of some factor(s) making it very vulnerable to extirpation from the subnation. Typically 6 to 20 occurrences* or few remaining individuals (1,000 to 3,000).
S3 Vulnerable: Vulnerable in the subnation either because rare and uncommon, or found only in a restricted range (even if abundant at some locations), or because of other factors making it vulnerable to extirpation. Typically 21 to 100 occurrences* or between 3,000 and 10,000 individuals.
S4 Apparently Secure: Uncommon but not rare, and usually widespread in the subnation. Possible cause of long-term concern. Usually more than 100 occurrences* and more than 10,000 individuals.
S5 Secure: Common, widespread, and abundant in the subnation. Essentially ineradicable under present conditions. Typically with considerably more than 100 occurrences* and more than 10,000 individuals.
SH Possibly Extirpated (Historical): Element occurred historically in the subnation, and there is some expectation that it may be rediscovered. Its presence may not have been verified in the past 20 years. An Element would become SH without such a 20-year delay if the only known occurrences* in a subnation were destroyed or if it had been extensively and unsuccessfully looked for. Upon verification of an extant occurrence, SH-ranked Elements would typically receive an S1 rank. The SH rank should be reserved for Elements for which some effort has been made to relocate occurrences, rather than simply using this rank for all Elements not known from verified extant occurrences.
SX Presumed Extinct: Element is believed to be extirpated from the subnation. Not located despite intensive searches of historical sites and other appropriate habitat, and virtually no likelihood that it will be rediscovered.
SNR Unranked: Subnational rank not yet assessed. This includes the former state rank S?
SU Unrankable: Currently unrankable due to lack of information or due to substantially conflicting information about status or trends.
S#S# Range Rank: A numeric range rank (e.g., S2S3) is used to indicate the range of uncertainty about the exact status of the Element. Ranges cannot skip more than one rank (e.g., SU is used rather than S1S4).
A conservation status rank is not applicable because the Element is not a suitable target of conservation activities for one of the following reasons:
Hybrid: Element represents an interspecific hybrid without conservation value. (Note that hybrids may be assigned a numeric rank if they do have conservation value).
Exotic Origin: Element is not native to the subnation (AZ).
Accidental/Nonregular: Element is not regularly found in the nation or subnation, in other words, infrequent and outside usual range.
Not Confidently Present: Element’s presence in the subnation has been reported, but the report is unconfirmed or doubtful; Element has been falsely reported, and may or may not potentially occur; Element mat potentially occur (e.g., habitat is suitable); Element was never present in the subnation despite presence in surrounding areas.
No Definable Occurrences*: Element is native and appears regularly but lacks practical conservation concern in the subnation because it is transient or occurs in a dispersed, unpredictable manner.
Synonym: Element reported as occurring in the subnation, but the state data center does not recognize the taxon; therefore the Element is not assigned a subnational rank.
Breeding Status Qualifiers (animals only)
B Breeding Basic rank refers to the breeding population of the Element in the subnation. May be used in conjunction with an ‘N’ qualifier, to denote when taxon has both breeding and non-breeding populations in the subnation.
N Nonbreeding: Basic rank refers to the non-breeding population of the Element in the subnation.
M Migrant: Basic rank refers to the transient/migratory population of the Element in the subnation.
*Note: A breeding status subrank is only used for animal species that have distinct breeding and/or non-breeding and/or migrant populations in the subnation. A rank for any of the population segments may be assigned alone or may be coupled with one or both of the other segment ranks. In the latter case, the ranks are separated by a comma, with the higher priority rank listed first (e.g., S2B,S3N,S5M; S1B,S3N; SHN,S4S5B).
? Inexact or Uncertain: Denotes inexact or uncertain numeric rank. (The ? qualifies the character immediately preceding it in the SRANK. The ? is not used in combination with range ranks).