List of vulnerable molluscs

As of September 2016, the International Union for Conservation of Nature (IUCN) lists 879 vulnerable mollusc species.[1] 12% of all evaluated mollusc species are listed as vulnerable. The IUCN also lists 18 mollusc subspecies as vulnerable.

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%)Circle frame.svg
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
Vulnerable (VU) species are considered to be facing a high risk of extinction in the wild.

No subpopulations of molluscs have been evaluated by the IUCN.

For a species to be assessed as vulnerable to extinction the best available evidence must meet quantitative criteria set by the IUCN designed to reflect "a high risk of extinction in the wild". Endangered and critically endangered species also meet the quantitative criteria of vulnerable species, and are listed separately. See: List of endangered molluscs, List of critically endangered molluscs. Vulnerable, endangered and critically endangered species are collectively referred to as threatened species 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.[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 vulnerable mollusc species and subspecies evaluated by the IUCN.

GastropodsEdit

There are 828 species and 16 subspecies of gastropod assessed as vulnerable.

StylommatophoraEdit

Stylommatophora includes the majority of land snails and slugs. There are 339 species and six subspecies in the order Stylommatophora assessed as vulnerable.

CharopidsEdit

HelicarionidsEdit

OrthalicidsEdit

EuconulidsEdit

StreptaxidsEdit

FerussaciidsEdit

HelminthoglyptidsEdit

OxychilidsEdit

CamaenidsEdit

LauriidsEdit

VertiginidsEdit

Species

Subspecies

TrissexodontidsEdit

HelicidsEdit

Species

Subspecies

HygromiidsEdit

Species

Subspecies

VitrinidsEdit

ChondrinidsEdit

EnidsEdit

Other StylommatophoraEdit

Species

Subspecies

LittorinimorphaEdit

There are 324 species and seven subspecies in the order Littorinimorpha assessed as vulnerable.

HydrobiidsEdit

Species

Subspecies

CochliopidsEdit

BithyniidsEdit

MoitessieriidsEdit

AssimineidsEdit

PomatiopsidsEdit

AmnicolidsEdit

Other Littorinimorpha speciesEdit

SorbeoconchaEdit

There are 55 species in the order Sorbeoconcha assessed as vulnerable.

PleuroceridsEdit

MelanopsidsEdit

ThiaridsEdit

PachychilidsEdit

PaludomidsEdit

ArchitaenioglossaEdit

Species

Subspecies

Lower Heterobranchia speciesEdit

CycloneritimorphaEdit

HygrophilaEdit

Species

Subspecies

NeogastropodaEdit

ConidsEdit

EupulmonataEdit

BivalviaEdit

There are 49 species and two subspecies in the class Bivalvia assessed as vulnerable.

UnionidaEdit

There are 37 species and two subspecies in the order Unionoida assessed as vulnerable.

MargaritiferidsEdit

UnionidsEdit

Species

Subspecies

HyriidsEdit

IridinidsEdit

Species

Subspecies

MycetopodidsEdit

CardiidaEdit

ArcidaEdit

VeneridaEdit

CephalopodsEdit

See alsoEdit

ReferencesEdit

  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.