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Illinois State Museum




State Species Status Ranking System

STATE SPECIES STATUS RANKING SYSTEM

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FLE = Federal List of Endangered Species

FTE = Federal List of Threatened Species

S1 = Critically imperiled in state because of extreme rarity (five or fewer occurrences or ery few remaining individuals or acres) or because of some factor(s) making it especially vulnerable to extirpation from the state.

S2 = Imperiled in state because of rarity (6 to 20 occurrences or few remaining individuals or acres) or because of some factor(s) making it very vulnerable to extirpation from the state.

S3 = Rare or uncommon in state (on the order of 21 to 100 occurrences).

S4 = Apparently secure in state, with many occurrences.

S5 = Demonstrably secure in state, and essentially ineradicable under present conditions.

S? = Not ranked to date.

SA = Accidental in state, including species recorded once or twice or only at very great intervals.

SE = An exotic established in the state.

SH = Of historical occurrence, perhaps not verified in the last 20 years and suspected to be still extant.

SLE = State List of Endangered Species.

SLT = State List of Threatened Species.

SQ = Taxon questionable.

SR = Reported, but without persuasive documentation.

SRF = Reported in error but this error persisted in literature.

SU = Possibly in peril but status uncertain, need more information.

SX = Apparently extirpated from the state.

WL = Placed on Illinois Watch List.


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