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List of critically endangered molluscs

Summary

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.

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[a]
  • 2972 are not threatened at present[b]
  • 1967 to 3955 are threatened[c]
  • 324 to 441 are extinct or extinct in the wild:
    • 311 extinct (EX) species[d]
    • 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.

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 edit

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

Stylommatophora edit

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 edit

Partulids edit

Achatinellids edit

Endodontids edit

Species

Subspecies

Charopids edit

Helicarionids edit

Orthalicids edit

Rhytidids edit

Streptaxids edit

Lauriids edit

Helicids edit

Hygromiids edit

Enids edit

Other Stylommatophora species edit

Littorinimorpha edit

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

Hydrobiids edit

Cochliopids edit

  • Heleobia dobrogica
  • Heleobia tritonum
  • Brune's tryonia (Tryonia brunei) (possibly extinct)

Bithyniids edit

  • Bithynia kastorias
  • Gabbia alticola
  • Gabbiella candida
  • Gabbiella depressa
  • Gabbiella matadina (possibly extinct)
  • Gabbiella neothaumaeformis
  • Gabbiella parva
  • Incertihydrobia teesdalei
  • Jubaia aethiopica
  • Pseudobithynia euboeensis
  • Pseudobithynia falniowskii
  • Pseudobithynia kathrinae
  • Pseudobithynia panetolis
  • Sierraia outambensis
  • Soapitia dageti (possibly extinct)

Moitessieriids edit

Assimineids edit

  • Kubaryia pilikia (possibly extinct)
  • Omphalotropis ingens (possibly extinct)
  • Pseudogibbula cara (possibly extinct)
  • Pseudogibbula duponti
  • Septariellina congolensis
  • Valvatorbis mauritii (possibly extinct)

Pomatiopsids edit

Sorbeoconcha edit

  • Pleurocera ampla (Elimia ampla)
  • Lily Shoals elimia (Elimia annettae)
  • Princess elimia (Elimia bellacrenata)
  • Mossy elimia (Elimia troostiana) (possibly extinct)
  • Leptoxis melanoides
  • Plicate rocksnail (Leptoxis plicata)
  • Melanoides agglutinans (possibly extinct)
  • Melanopsis ammonis
  • Melanopsis brevicula
  • Melanopsis chlorotica
  • Melanopsis germaini (possibly extinct)
  • Melanopsis infracincta (possibly extinct)
  • Melanopsis khabourensis (possibly extinct)
  • Melanopsis pachya (possibly extinct)
  • Melanopsis parreyssii
  • Melanopsis penchinati
  • Melanopsis saharica
  • Corpulent hornsnail (Pleurocera corpulenta)
  • Potadoma kadeii
  • Potadoma wansoni
  • Pseudocleopatra dartevellei
  • Tylomelania kruimeli

Architaenioglossa edit

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

Cyclophorids edit

Diplommatinids edit

Viviparids edit

Other Architaenioglossa species edit

Cycloneritimorpha edit

Hygrophila edit

Species

Subspecies

  • Bulinus tropicus torensis

Neogastropoda edit

Other gastropod species edit

Bivalvia edit

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

Unionida edit

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

Margaritiferids edit

Species

Subspecies

Etheriids edit

  • Acostaea rivolii

Unionids edit

Species

Subspecies

Hyriids edit

Venerida edit

Cephalopods edit

See also edit

References edit

  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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