^Threatened comprises CR, EN and VU. Upper estimate additionally includes DD.
^Chart omits extinct (EX) species
Endangered (EN) species are considered to be facing a very high risk of extinction in the wild.
In September 2016, the International Union for Conservation of Nature (IUCN) listed 507 endangered mollusc species.[1] Of all evaluated mollusc species, 7.0% 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 extinction". 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 (27% of those evaluated) 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.[2] While the category of data deficient indicates that no assessment of extinction risk has been made for the taxa, the IUCN notes that it may be appropriate to give them "the same degree of attention as threatened taxa, at least until their status can be assessed".[3]
This is a complete list of endangered mollusc species and subspecies evaluated by the IUCN.
^"IUCN Red List version 2016-2". The IUCN Red List of Threatened Species. International Union for Conservation of Nature and Natural Resources. Retrieved 8 September 2016.
^"Limitations of the Data". The IUCN Red List of Threatened Species. Union for Conservation of Nature and Natural Resources. Retrieved 11 January 2016.
^"2001 Categories & Criteria (version 3.1)". The IUCN Red List of Threatened Species. Union for Conservation of Nature and Natural Resources. Retrieved 11 January 2016.
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