List of critically endangered molluscs explained

As of September 2016, the International Union for Conservation of Nature (IUCN) listed 581 critically endangered mollusc species, including 117 which are tagged as possibly extinct.^{[1] [2]} Of all evaluated mollusc species, 8.0% are listed as critically endangered. The IUCN also lists 11 mollusc subspecies as critically endangered.

No subpopulations of molluscs have been evaluated 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.^[3] 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".^[4]

This is a complete list of critically endangered mollusc species and subspecies evaluated by the IUCN. Species considered possibly extinct by the IUCN are marked as such.

Gastropods

There are 511 species and six subspecies of gastropod assessed as critically endangered.

Stylommatophora

Stylommatophora includes the majority of land snails and slugs. There are 233 species and five subspecies in the order Stylommatophora assessed as critically endangered.

Endodontids

SpeciesSubspecies

Other Stylommatophora species

Littorinimorpha

There are 181 species in the order Littorinimorpha assessed as critically endangered.

Moitessieriids

• Henrigirardia wienini (possibly extinct)
• Spiralix corsica (possibly extinct)

Pomatiopsids

Architaenioglossa

There are 48 species in the order Architaenioglossa assessed as critically endangered.

Other Architaenioglossa species

Hygrophila

SpeciesSubspecies

• Bulinus tropicus torensis

Other gastropod species

Bivalvia

There are 69 species and five subspecies in the class Bivalvia assessed as critically endangered.

Unionida

There are 66 species and five subspecies in the order Unionoida assessed as critically endangered.

Margaritiferids

SpeciesSubspecies

• Margaritifera margaritifera durrovensis

Etheriids

• Acostaea rivolii

Unionids

SpeciesSubspecies

Hyriids

• Glenelg freshwater mussel (Hyridella glenelgensis)

Venerida

Cephalopods

• Opisthoteuthis chathamensis

See also

• Lists of IUCN Red List critically endangered species
• List of least concern molluscs
• List of near threatened molluscs
• List of vulnerable molluscs
• List of 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 (IUCN). 8 September 2016.
2. Web site: Table 9: Possibly Extinct and Possibly Extinct in the Wild Species (IUCN Red List version 2016-2). The IUCN Red List of Threatened Species. Union for Conservation of Nature and Natural Resources (IUCN). 8 September 2016.
3. Web site: Limitations of the Data. The IUCN Red List of Threatened Species. Union for Conservation of Nature and Natural Resources (IUCN). 11 January 2016.
4. Web site: 2001 Categories & Criteria (version 3.1). The IUCN Red List of Threatened Species. Union for Conservation of Nature and Natural Resources (IUCN). 11 January 2016.