IUCN Threat Categories
Categories of threat according to IUCN.
The International Union for the Conservation of Nature and Natural Resources
(IUCN) recommends the
classification in the following categories:
- EX – Extinct: The last remaining member of the species has died, or
is presumed beyond reasonable doubt to have died.
- EW – Extinct in the Wild: Captive individuals survive, but there is
no free-living, natural population. Example: Several species of
Pacific tree snails (Partula).
- CR – Critically Endangered: Faces an extremely high risk of
extinction in the immediate future. Example:
Desmoulins' whorl snail (Vertigo moulinsiana).
- EN – Endangered: Faces a very high risk of extinction in the near
snail (Lauria cylindrica).
- VU – Vulnerable: Faces a high risk of extinction in the medium-term.
bladder snail (Aplexa hypnorum).
- NT – Near Threatened: May be considered threatened in the near
snail (Vallonia costata).
- LC – Least Concern: No immediate threat to the survival of the
- DD – Data Deficient
- NE – Not Evaluated