page_title: List of endangered molluscs
section_title: Stylommatophora
hierarchical_section_title: List of endangered molluscs / Gastropods / Stylommatophora
caption_attribution_description: The polygyrid land snail Mesodon clenchi, 21 mm in diameter (abt 13/16 inch), from Cherokee County, Oklahoma, USA; 1962.
context_page_description: As of September 2016, the International Union for Conservation of Nature lists 507 endangered mollusc species. 7.0% of all evaluated mollusc species are listed as endangered.
  The IUCN also lists nine mollusc subspecies as endangered.
  No subpopulations of molluscs have been evaluated by the IUCN.
  For a species to be considered endangered by the IUCN it must meet certain quantitative criteria which are designed to classify taxa facing "a very high risk of exintction". An even higher risk is faced by critically endangered species, which meet the quantitative criteria for endangered species. Critically endangered molluscs are listed separately. There are 1088 mollusc species which are endangered or critically endangered.
  Additionally 1988 mollusc species are listed as data deficient, meaning there is insufficient information for a full assessment of conservation status. As these species typically have small distributions and/or populations, they are intrinsically likely to be threatened, according to the IUCN.
context_section_description: Stylommatophora is a very diverse group that includes the majority of land snails and slugs. There are 187 species and two subspecies in the order Stylommatophora assessed as endangered.
caption: Different views of a shell of Patera clenchi
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