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 1988

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 ...

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. 27% of all evaluated mollusc species are listed as data deficient. The IUCN also lists 40 mollusc subspecies as data deficient. No subpopulations of molluscs have been evaluated by the IUCN. This is a complete list of data deficient 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 1526 species and 37 subspecies of gastropod evaluated as data deficient.

Vetigastropoda Vetigastropoda is a major Taxonomy (biology), taxonomic group of sea snails, marine (ocean), marine gastropod mollusc, mollusks that form a very ancient lineage (evolution), lineage. Taxonomically the Vetigastropoda are sometimes treated as an O ...

*'' Teinostoma fernandesi'' *'' Teinostoma funiculatum''

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 392 species and 32 subspecies in the order Stylommatophora evaluated as data deficient.

Partulids

Subulinids

Species Subspecies *''

Opeas nothapalinus crenatum ''Opeas'' is a genus of small, tropical, air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Achatinidae. ''Opeas'' is the type genus of the subfamily Opeatinae. Species The genus ''Opeas'' includes the follo ...

'' *''

Pseudoglessula leroyi fasciata ''Pseudoglessula'' is a genus of small air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Achatinidae. Species Species within the genus ''Pseudoglessula'' include: * ''Pseudoglessula acutissima'' Verdcourt * ' ...

Achatinellids

Endodontids

Charopids

Helicarionids

Orthalicids

Euconulids

Rhytidids

Streptaxids

Species Subspecies

Zonitids

Pupillids

Polygyrids

Species Subspecies

Helminthoglyptids

Species * Shasta sideband ''(Monadenia troglodytes)'' Subspecies

Camaenids

Lauriids

Vertiginids

Bradybaenids

Species Subspecies *'' Euhadra scaevola mikawa''

Helicids

Hygromiids

Enids

Other Stylommatophora

Species Subspecies * Idaho banded mountain snail ''(Oreohelix idahoensis idahoensis)'' * Carinated striate banded mountain snail ''(Oreohelix strigosa goniogyra)''

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 565 species and one subspecies in the order Littorinimorpha evaluated as data deficient.

Strombids

*'' Ophioglossolambis violacea''

Pomatiids

Hydrobiids

Cochliopids

Bithyniids

Species Subspecies *'' Gabbiella humerosa tanganyicensis''

Moitessieriids

Assimineids

Pomatiopsids

Lithoglyphids

Amnicolids

Stenothyrids

Iravadiids

Truncatellids

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 97 species and one subspecies in the order Sorbeoconcha evaluated as data deficient.

Batillarids

*''

Batillaria mutata ''Batillaria mutata'' is a species of small mudflat saltwater snail, a marine gastropod mollusk in the family Batillariidae, the horn snails. Distribution This species is endemic to Ecuador Ecuador ( ; ; Quechua: ''Ikwayur''; Shuar: ...

Pleurocerids

Melanopsids

Semisulcospirids

* Oasis juga ''(Juga laurae)''

Thiarids

Pachychilids

Paludomids

Species Subspecies *'' Cleopatra bulimoides pauli''

Architaenioglossa

There are 106 species and one subspecies in the order Architaenioglossa evaluated as data deficient.

Neocyclotids

Cyclophorids

Species Subspecies *'' Chamalychaeus itonis nakashimai''

Pupinids

Diplommatinids

Aciculids

Viviparids

Ampullariids

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 ...

There are 30 species and two subspecies in the order Cycloneritimorpha evaluated as data deficient.

Helicinids

Species Subspecies *'' Pleuropoma zigzac ponapense'' *'' Pleuropoma zigzac zigzac''

Hydrocenids

Neritids

Hygrophila species

There are 197 Hygrophila species evaluated as data deficient.

Physids

Acroloxids

Planorbids

Lymnaeids

Chilinids

Latiids

*'' Latia lateralis''

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 ...

There are 113 species in the order Neogastropoda evaluated as data deficient.

Turrids

Marginellids

Buccinids

Muricids

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 ...

Archaeopulmonata

*'' Salinator sanchezi'' *'' Salinator swatowensis''

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 171 species and three subspecies in the class Bivalvia evaluated as data deficient.

Pectinida Pectinida is a taxonomic order of large and medium-sized saltwater clams, marine bivalve molluscs, commonly known as scallops and their allies. It is believed that they began evolutionarily in the late Middle Ordovician epoch; many species, of ...

*''

Nodipecten magnificus ''Nodipecten magnificus'' is a species of bivalve in the family Pectinidae. It is endemic to Ecuador Ecuador ( ; ; Quechua: ''Ikwayur''; Shuar: ''Ecuador'' or ''Ekuatur''), officially the Republic of Ecuador ( es, República del Ecuad ...

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 Fa ...

There are 95 species in the order Unionoida evaluated as data deficient.

Margaritiferids

*'' Margaritifera dahurica'' *'' Margaritifera laevis''

Unionids

Hyriids

Iridinids

Mycetopodids

*'' Anodontites elongatus'' *'' Anodontites trigonus''

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, ...

There are 74 species and three subspecies in the order Veneroida evaluated as data deficient.

Donacids

Solecurtids

*'' Novaculina siamensis''

Mytilida

*''

Sinomytilus morrisoni ''Sinomytilus'' is a genus of saltwater, brackish water and freshwater clams, marine bivalve molluscs in the subfamily Septiferinae of the family Mytilidae, the mussels.MolluscaBase eds. (2022). MolluscaBase. Sinomytilus Thiele, 1934. Accesse ...

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 ...

There are 291 cephalopod species evaluated as data deficient.

Idiosepiida

Octopuses An octopus ( : octopuses or octopodes, see below for variants) is a soft-bodied, eight- limbed mollusc of the order Octopoda (, ). The order consists of some 300 species and is grouped within the class Cephalopoda with squids, cuttlefish ...

There are 34 octopus species evaluated as data deficient.

Grimpoteuthis ''Grimpoteuthis'' is a genus of pelagic umbrella octopuses known as the dumbo octopuses. The name "dumbo" originates from their resemblance to the title character of Disney's 1941 film ''Dumbo'', having a prominent ear-like fin which extends from ...
species

Oegopsina Oegopsida is one of the two orders of squid in the superorder Decapodiformes, in the class Cephalopoda. Together with the Myopsina, it was formerly considered to be a suborder of the order Teuthida, in which case it was known as Oegopsina. T ...
species

There are 104 Oegopsina species evaluated as data deficient.

Mastigoteuthidae The Mastigoteuthidae, also known as whip-lash squid, are a family of small deep-sea squid. Approximately 20 known species in six genera are represented, with members found in both the mesopelagic and bathypelagic zone of most oceans. Originally d ...

Other Oegopsina species

Bathyteuthida

References

*Molluscs Data deficient molluscs {{bots, deny=BG19bot,Yobot