IUCN categories for classification of the Red list species | MYCO-LICH

IUCN categories for classification of the Red list species

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Species are classified in nine groups, set through criteria such as rate of decline, population size, area of geographic distribution, and degree of population and distribution fragmentation.

  • Extinct (EX) - No individuals remaining.
  • Extinct in the Wild (EW) - Known only to survive in captivity, or as a naturalized population outside its historic range.
  • Critically Endangered (CR) - Extremely high risk of extinction in the wild.
  • Endangered (EN) - High risk of extinction in the wild.
  • Vulnerable (VU) - High risk of endangerment in the wild.
  • Near Threatened (NT) - Likely to become endangered in the near future.
  • Least Concern (LC) - Lowest risk. Does not qualify for a more at risk category. Widespread and abundant taxa are included in this category.
  • Data Deficient (DD) - Not enough data to make an assessment of its risk of extinction.
  • Not Evaluated (NE) - Has not yet been evaluated against the criteria.

When discussing the IUCN Red List, the official term "threatened" is a grouping of three categories: Critically Endangered, Endangered, and Vulnerable.