List of endangered molluscs


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. 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."
This is a complete list of endangered mollusc species and subspecies evaluated by the IUCN.

Gastropods">Gastropoda">Gastropods

There are 448 species and seven subspecies of gastropod assessed as endangered.

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.

Partulids">Partulidae">Partulids

Achatinellids">Achatinellidae">Achatinellids

Cerastids">Cerastidae">Cerastids

Endodontids">Endodontidae">Endodontids

Charopids">Charopidae">Charopids

Helicarionids">Helicarionidae">Helicarionids

Orthalicids">Orthalicidae">Orthalicids

Species
Subspecies

Streptaxids">Streptaxidae">Streptaxids

Species
Subspecies

Helicids">Helicidae">Helicids

Hygromiids">Hygromiidae">Hygromiids

Other stylommatophoran species

Littorinimorpha

There are 147 littorinimorph species and three subspecies assessed as endangered.

Hydrobiids">Hydrobiidae">Hydrobiids

Bithyniids">Bithyniidae">Bithyniids

Species
Subspecies

Assimineids">Assimineidae">Assimineids

Pomatiopsids">Pomatiopsidae">Pomatiopsids

Other Littorinimorpha species

[Sorbeoconcha]

[Architaenioglossa]

Species
Subspecies

Hygrophila">Hygrophila (gastropod)">Hygrophila species

There are 22 Hygrophila species assessed as endangered.

Planorbids">Planorbidae">Planorbids

Lymnaeids">Lymnaeidae">Lymnaeids

[Neogastropoda]

Other gastropod species

[Bivalvia]

There are 57 species and two subspecies in the class Bivalvia assessed as endangered.

[Unionida]

There are 54 species and two subspecies in the order Unionoida assessed as endangered.

Margaritiferids">Margaritiferidae">Margaritiferids

Unionids">Unionidae">Unionids

Species
Subspecies

[Venerida]

Cephalopods">Cephalopoda">Cephalopods