List of endangered molluscs

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%)Circle frame.svg
  •   Extinct in the wild (EW): 14 species
  •   Critically endangered (CR): 581 species
  •   Endangered (EN): 507 species
  •   Vulnerable (VU): 879 species
  •   Near threatened (NT, LR/cd): 535 species
  •   Least concern (LC): 2,437 species
  •   Data deficient (DD): 1,988 species
Mollusc species (IUCN, 2016.1)
  • 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:
    • 310 extinct (EX) species[lower-alpha 4]
    • 14 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
Endangered (EN) species are considered to be facing a very high risk of extinction in the wild.

As of September 2016, the International Union for Conservation of Nature (IUCN) lists 507 endangered mollusc species.[1] 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 (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 endangered mollusc species and subspecies evaluated by the IUCN.

Gastropods

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

Stylommatophora

Stylommatophora includes the majority of land snails and slugs. There are 187 species and two subspecies in the order Stylommatophora assessed as endangered.

Partulids

Achatinellids

Cerastids

  • Pachnodus becketti
  • Pachnodus fregatensis
  • Pachnodus kantilali
  • Pachnodus niger
  • Pachnodus ornatus

Endodontids

Charopids

Helicarionids

Orthalicids

Species

Subspecies

Euconulids

Streptaxids

Species

Subspecies

Camaenids

Helicids

Hygromiids

Other Stylommatophora species

Littorinimorpha

There are 147 species and three subspecies in the order Littorinimorpha assessed as endangered.

Hydrobiids

Bithyniids

Species

  • Bithynia pesicii
  • Bithynia prespensis
  • Bithynia skadarskii
  • Bithynia zeta
  • Funduella incisa
  • Gabbiella barthi
  • Gabbiella spiralis
  • Gabbiella tchadiensis
  • Gabbiella verdcourti
  • Liminitesta sulcata
  • Pseudobithynia levantica
  • Pseudobithynia trichonis

Subspecies

  • Gabbiella humerosa alberti
  • Gabbiella humerosa edwardi
  • Gabbiella humerosa kyogae

Assimineids

Pomatiopsids

  • Fenouilia kreitneri
  • Pachydrobia zilchi
  • Tomichia differens
  • Tomichia ventricosa
  • Tomichia zwellendamensis

Other Littorinimorpha species

Sorbeoconcha

Architaenioglossa

Species

Subspecies

Cycloneritimorpha

Hygrophila species

There are 22 Hygrophila species assessed as endangered.

Planorbids

Lymnaeids

  • Lymnaea maroccana
  • Radix pinteri
  • Radix skutaris
  • Shortspire pondsnail (Stagnicola idahoensis)
  • Stagnicola kayseris

Neogastropoda

Other gastropod species

Bivalvia

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

Unionoida

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

Margaritiferids

Unionids

Species

Subspecies

Other Unionoida species

Veneroida

  • Corbicula possoensis
  • Pisidium edlaueri
  • Pisidium maasseni

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. ↑ "Limitations of the Data". The IUCN Red List of Threatened Species. Union for Conservation of Nature and Natural Resources (IUCN). Retrieved 11 January 2016.
  3. ↑ "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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