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:

Critically endangered: Desmoulins' whorl snail (Vertigo moulin-
). Picture: Gilles St. Martin (Original).
Endangered: Chrysalis snail (Lauria cylindracea).
Picture: Kristiina Ovaska. Source: CalPhotos.
Vulnerable: Moss bladder snail (Aplexa hypnorum).
Picture: Alexander Mrkvicka, Vienna (mrkvicka.at).