Wikipedia

List of critically endangered molluscs

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.

12 extinct in the wild mollusc species (0.13%)785 critically endangered mollusc species (8.3%)708 endangered mollusc species (7.5%)1123 vulnerable mollusc species (11.8%)823 near threatened mollusc species (8.7%)3526 least concern mollusc species (37.1%)2229 data deficient mollusc species (23.5%)
Mollusc species (IUCN, 2025.2)
  • 9,502 extant species have been evaluated
  • 7,273 of those are fully assessed[a]
  • 4,358 are not threatened at present[b]
  • 2,915 to 5,144 are threatened[c]
  • 308 to 476 are extinct or extinct in the wild:
    • 296 extinct (EX) species[d]
    • 12 extinct in the wild (EW)
    • 167 possibly extinct [CR(PE)]
    • 1 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.

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

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

Stylommatophora

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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

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Partulids

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Achatinellids

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Endodontids

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Charopids

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Helicarionids

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Orthalicids

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Rhytidids

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Streptaxids

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Lauriids

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Helicids

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Hygromiids

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Enids

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Other Stylommatophora species

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Littorinimorpha

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

Hydrobiids

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Cochliopids

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Bithyniids

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Moitessieriids

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Assimineids

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Pomatiopsids

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Sorbeoconcha

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Architaenioglossa

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

Cyclophorids

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Diplommatinids

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Viviparids

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Other Architaenioglossa species

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Cycloneritimorpha

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Hygrophila

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Neogastropoda

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Other gastropod species

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Bivalvia

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

Unionida

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

Margaritiferids

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Species

Subspecies

Etheriids

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Unionids

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Species

Subspecies

Hyriids

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Venerida

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Cephalopods

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See also

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References

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  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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