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

14 extinct in the wild mollusc species (0.20%)581 critically endangered mollusc species (8.4%)507 endangered mollusc species (7.3%)879 vulnerable mollusc species (13%)535 near threatened mollusc species (7.7%)2437 least concern mollusc species (35%)1988 data deficient mollusc species (29%)
Mollusc species (IUCN, 2020.1)
  • 6941 extant species have been evaluated
  • 4953 of those are fully assessed[lower-alpha 1]
  • 2972 are not threatened at present[lower-alpha 2]
  • 1967 to 3955 are threatened[lower-alpha 3]
  • 324 to 441 are extinct or extinct in the wild:
    • 311 extinct (EX) species[lower-alpha 4]
    • 13 extinct in the wild (EW)
    • 117 possibly extinct [CR(PE)]
    • 0 possibly extinct in the wild [CR(PEW)]
  1. excludes data deficient evaluations.
  2. NT, LR/cd, LC.
  3. Threatened comprises CR, EN and VU. Upper estimate additionally includes DD.
  4. Chart omits extinct (EX) species
Critically Endangered (CR) species face an extremely high risk of extinction in the wild.
Critically Endangered (CR) species face an extremely high risk of extinction in the wild.

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.


Amastrids


Partulids


Achatinellids


Endodontids

Species

Subspecies


Charopids


Helicarionids


Orthalicids


Rhytidids


Streptaxids


Lauriids


Helicids


Hygromiids


Enids


Other Stylommatophora species


Littorinimorpha


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


Hydrobiids


Cochliopids


Bithyniids


Moitessieriids


Assimineids


Pomatiopsids


Sorbeoconcha



Architaenioglossa


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


Cyclophorids


Diplommatinids


Viviparids


Other Architaenioglossa species


Cycloneritimorpha



Hygrophila


Species

Subspecies


Neogastropoda



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

Species

Subspecies


Etheriids


Unionids

Species

Subspecies


Hyriids


Venerida



Cephalopods



See also



References


  1. "IUCN Red List version 2016-2". The IUCN Red List of Threatened Species. International Union for Conservation of Nature and Natural Resources (IUCN). Retrieved 8 September 2016.
  2. "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). Retrieved 8 September 2016.
  3. "Limitations of the Data". The IUCN Red List of Threatened Species. Union for Conservation of Nature and Natural Resources (IUCN). Retrieved 11 January 2016.
  4. "2001 Categories & Criteria (version 3.1)". The IUCN Red List of Threatened Species. Union for Conservation of Nature and Natural Resources (IUCN). Retrieved 11 January 2016.


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