As of September 2016, the

International Union for Conservation of Nature The International Union for Conservation of Nature (IUCN; officially International Union for Conservation of Nature and Natural Resources) is an international organization working in the field of nature conservation and sustainable use of natu ...

(IUCN) lists 879 vulnerable

mollusc Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are known as molluscs or mollusks (). Around 85,000 extant species of molluscs are recognized. The number of fossil species is esti ...

species. 12% of all evaluated mollusc species are listed as vulnerable. The IUCN also lists 18 mollusc subspecies as vulnerable. 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 As of September 2016, the International Union for Conservation of Nature (IUCN) lists 507 Endangered species, endangered Mollusca, mollusc species. 7.0% of all evaluated mollusc species are listed as endangered. The IUCN also lists nine mollusc ...

List of critically endangered molluscs 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''. 8.0% of all evaluated mollusc species are listed as criti ...

. Vulnerable, endangered and critically endangered species are collectively referred to as ''

threatened species Threatened species are any species (including animals, plants and fungi) which are vulnerable to endangerment in the near future. Species that are threatened are sometimes characterised by the population dynamics measure of ''critical depensa ...

'' by the IUCN. Additionally 1988 mollusc species (27% of those evaluated) are listed as ''

data deficient A data deficient (DD) species is one which has been categorized by the International Union for Conservation of Nature (IUCN) as offering insufficient information for a proper assessment of conservation status to be made. This does not necessaril ...

'', 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. 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." This is a complete list of vulnerable mollusc species and subspecies evaluated by the IUCN.

Gastropods The gastropods (), commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, from freshwater, and from land. Ther ...

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

Stylommatophora Stylommatophora is an orderPhilippe Bouchet, Jean-Pierre Rocroi, Bernhard Hausdorf, Andrzej Kaim, Yasunori Kano, Alexander Nützel, Pavel Parkhaev, Michael Schrödl and Ellen E. Strong. 2017. Revised Classification, Nomenclator and Typification ...

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

Charopids

Helicarionids

Orthalicids

Euconulids

Streptaxids

Ferussaciids

Helminthoglyptids

Oxychilids

Camaenids

Lauriids

Vertiginids

Species Subspecies *'' Anauchen informis informis'' *'' Anauchen informis parcedentata''

Trissexodontids

Helicids

Species Subspecies *'' Hemicycla glyceia silensis''

Hygromiids

Species Subspecies *'' Leptaxis simia portosancti''

Vitrinids

Chondrinids

Enids

Other Stylommatophora

Species Subspecies *'' Chlorilis hungerfordiana rufopila'' *'' Spelaeodiscus triarius tatricus''

Littorinimorpha Littorinimorpha is a large order of snails, gastropods, consisting primarily of sea snails ( marine species), but also including some freshwater snails ( aquatic species) and land snails (terrestrial species).Bouchet P. & Rocroi J.-P. (Ed.); Fr� ...

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

Hydrobiids

Species Subspecies

Cochliopids

Bithyniids

Moitessieriids

Assimineids

Pomatiopsids

Amnicolids

Other Littorinimorpha species

Sorbeoconcha Sorbeoconcha is a taxonomic clade of snails, i.e. gastropods, mainly marine species with gills and opercula, within the clade Caenogastropoda. The taxon Sorbeoconcha was named by Winston Ponder and David R. Lindberg in 1997. Taxonomy 1 ...

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

Pleurocerids

Melanopsids

*'' Esperiana sangarica'' *'' Melanopsis subgraellsiana''

Thiarids

Pachychilids

Paludomids

Architaenioglossa Architaenioglossa is a taxonomic group of snails which have gills and often an operculum. They are primarily land and freshwater gastropod mollusks within the clade Caenogastropoda. This " informal group" has been shown to be polyphyletic in a s ...

Species Subspecies *'' Renea moutonii moutonii'' *''

Renea moutonii singularis ''Renea moutonii singularis'' is a subspecies of land snail with an operculum, a terrestrial gastropod mollusk in the family Aciculidae. It was described by Pollonera in 1905. The common name is needle snail.Conchology Inc http://www.conchol ...

Lower Heterobranchia Lower Heterobranchia, also known as the Allogastropoda, is a group of rather specialized, highly evolved sea slugs and sea snails, ( marine gastropod mollusks) within the subclass Heterobranchia. WoRMS (2020). "Lower Heterobranchia". Accessed ...
species

Cycloneritimorpha Cycloneritida (nerites and false-limpets) is an order of land snails, freshwater snails, and sea snails.MolluscaBase eds. (2020). MolluscaBase. Cycloneritida. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/ap ...

Hygrophila

Species Subspecies *'' Gyraulus connollyi exilis''

Neogastropoda Neogastropoda is an order of sea snails, both freshwater and marine gastropod molluscs. Description The available fossil record of Neogastropoda is relatively complete, and supports a widely accepted evolutionary scenario of an Early Creta ...

Conids

Eupulmonata Eupulmonata is a taxonomic clade of air-breathing snails. The great majority of this group are land snails and slugs, but some are marine and some are saltmarsh snails that can tolerate salty conditions. Linnean taxonomy *Suborder Eupulmonat ...

*'' Zospeum biscaiense'' *'' Zospeum exiguum''

Bivalvia Bivalvia (), in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of marine and freshwater molluscs Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of w ...

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

Unionida Unionida is a monophyletic order of freshwater mussels, aquatic bivalve molluscs.Bieler R., Carter J.G. & Coan E.V. (2010). ''Classification of Bivalve families''. pp. 113–133, in: Bouchet P. & Rocroi J.-P. (2010), ''Nomenclator of Bivalve F ...

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

Cardiida Cardiida is an order of bivalves belonging to the class Bivalvia. Families: * Cardiidae * Donacidae * Ephippiodontidae * Ferganoconchidae * Glaucomyidae * Goniocardiidae * Icanotiidae * Lahillidae * Limnocyrenidae * Lutetidae * Psammob ...

Arcida The Arcida is an extant order of bivalve molluscs. This order dates back to the lower Ordovician period. They are distinguished from related groups, such as the mussels, by having a straight hinge to the shells, and the adductor muscles being ...

*'' Scaphula nagarjunai''

Venerida Venerida (formerly Veneroida) is an order of mostly saltwater but also some freshwater bivalve molluscs. This order includes many familiar groups such as many clams that are valued for food and a number of freshwater bivalves. Since the 2000s, ...

Cephalopods A cephalopod is any member of the molluscan class Cephalopoda (Greek plural , ; "head-feet") such as a squid, octopus, cuttlefish, or nautilus. These exclusively marine animals are characterized by bilateral body symmetry, a prominent head, an ...

*'' Opisthoteuthis calypso'' *'' Opisthoteuthis massyae''

References

*Molluscs Vulnerable molluscs Vulnerable molluscs {{bots, deny=BG19bot,Yobot