List of vulnerable molluscs explained

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.

Gastropods

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

Stylommatophora

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

Vertiginids

SpeciesSubspecies

• Anauchen informis informis
• Anauchen informis parcedentata

Helicids

SpeciesSubspecies

• Hemicycla glyceia silensis

Hygromiids

SpeciesSubspecies

• Leptaxis simia portosancti

Other Stylommatophora

SpeciesSubspecies

• Chlorilis hungerfordiana rufopila
• Spelaeodiscus triarius tatricus

Littorinimorpha

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

Hydrobiids

Species

Subspecies

Other Littorinimorpha species

Sorbeoconcha

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

Melanopsids

• Esperiana sangarica
• Melanopsis subgraellsiana

Paludomids

Architaenioglossa

SpeciesSubspecies

• Renea moutonii moutonii
• Renea moutonii singularis

Hygrophila

SpeciesSubspecies

• Gyraulus connollyi exilis

Neogastropoda

Conids

Eupulmonata

• Zospeum biscaiense
• Zospeum exiguum

Bivalvia

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

Unionida

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

Margaritiferids

• Middendorff's freshwater pearl mussel (Margaritifera middendorffi)

Unionids

SpeciesSubspecies

• Lampsilis reeviana reeviana

Iridinids

SpeciesSubspecies

• Chambardia wahlbergi guillaini

Mycetopodids

• Diplodontites olssoni

Arcida

• Scaphula nagarjunai

Venerida

Cephalopods

• Opisthoteuthis calypso
• Opisthoteuthis massyae

See also

• 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

Notes and References

1. Web site: IUCN Red List version 2016-2. The IUCN Red List of Threatened Species. International Union for Conservation of Nature and Natural Resources . 8 September 2016.
2. Web site: Limitations of the Data. The IUCN Red List of Threatened Species. Union for Conservation of Nature and Natural Resources . 11 January 2016.
3. Web site: 2001 Categories & Criteria (version 3.1). The IUCN Red List of Threatened Species. Union for Conservation of Nature and Natural Resources . 11 January 2016.