List of vulnerable molluscs

In September 2016, the International Union for Conservation of Nature (IUCN) listed 879 vulnerable mollusc species.^[1] Of all evaluated mollusc species, 12% are listed as vulnerable. The IUCN also lists 18 mollusc subspecies as vulnerable.

No subpopulations of molluscs have been evaluated by the IUCN.

For a species to be assessed as vulnerable to extinction the best available evidence must meet quantitative criteria set by the IUCN designed to reflect "a high risk of extinction in the wild". Endangered and critically endangered species also meet the quantitative criteria of vulnerable species, and are listed separately. See: List of endangered molluscs, List of critically endangered molluscs. Vulnerable, endangered and critically endangered species are collectively referred to as threatened species by the IUCN.

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 vulnerable mollusc species and subspecies evaluated by the IUCN.

There are 828 species and 16 subspecies of gastropod assessed as vulnerable.

Stylommatophora includes the majority of land snails and slugs. There are 339 species and six subspecies in the order Stylommatophora assessed as vulnerable.

Species

Subspecies

• Anauchen informis informis
• Anauchen informis parcedentata

Species

Subspecies

• Hemicycla glyceia silensis

Species

Subspecies

• Leptaxis simia portosancti

Species

Subspecies

• Chlorilis hungerfordiana rufopila
• Spelaeodiscus triarius tatricus

There are 324 species and seven subspecies in the order Littorinimorpha assessed as vulnerable.

Species

Subspecies

There are 55 species in the order Sorbeoconcha assessed as vulnerable.

• Esperiana sangarica
• Melanopsis subgraellsiana

Species

Subspecies

• Renea moutonii moutonii
• Renea moutonii singularis

Species

Subspecies

• Gyraulus connollyi exilis

• Zospeum biscaiense
• Zospeum exiguum

There are 49 species and two subspecies in the class Bivalvia assessed as vulnerable.

There are 37 species and two subspecies in the order Unionoida assessed as vulnerable.

• Middendorff's freshwater pearl mussel (Margaritifera middendorffi)

Species

Subspecies

• Lampsilis reeviana reeviana

Species

Subspecies

• Chambardia wahlbergi guillaini

• Diplodontites olssoni

• Scaphula nagarjunai

• Opisthoteuthis calypso
• Opisthoteuthis massyae

• Lists of IUCN Red List vulnerable species
• List of least concern molluscs
• List of near threatened molluscs
• List of endangered molluscs
• List of critically endangered molluscs
• List of recently extinct molluscs
• List of data deficient molluscs