List of vulnerable invertebrates

Extinct, since 1500: 394 species
Extinct in the wild (EW): 16 species
Critically endangered (CR): 961 species
Endangered (EN): 1,119 species
Vulnerable (VU): 2,121 species
Near threatened (NT, LR/cd): 1,079 species
Least concern (LC): 6,699 species
Data deficient (DD): 5,127 species

Invertebrate species (IUCN, 2015.4)

17,516 species have been evaluated
12,389 are fully assessed (excludes DD)
7778 are not threatened at present (LC, NT, LR/cd)
4201 are threatened (CR, EN, VU)
410 to 609 are extinct or extinct in the wild (EX, EW, CR(PE), CR(PEW))

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

As of February 2016, the International Union for Conservation of Nature (IUCN) lists 2121 vulnerable invertebrate species.^[1] 12% of all evaluated invertebrate species are listed as vulnerable. The IUCN also lists 45 invertebrate subspecies as vulnerable.

No subpopulations of invertebrates 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 face an even higher risk, and are listed separately even though they also meet the quantitative criteria for vulnerable species: List of endangered invertebrates, List of critically endangered invertebrates. The three categories combined are referred to as threatened species.

Additionally 5127 invertebrate species (29% 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 invertebrate species and subspecies as evaluated by the IUCN. Where possible common names for taxa are given while links point to the scientific name used by the IUCN.

Nemertea species

Nightingale ribbon worm

Annelids

Giant Palouse earthworm

Onychophora

Molluscs

There are 871 mollusc species and 16 mollusc subspecies assessed as vulnerable.

Gastropoda

There are 821 species and 14 subspecies in the class Gastropoda assessed as vulnerable.

Stylommatophora

There are 336 species and four subspecies in the order Stylommatophora assessed as vulnerable. Stylommatophora includes the majority of land snails and slugs.

Charopids

Helicarionids

Orthalicids

Euconulids

Streptaxids

Ferussaciids

Helminthoglyptids

Camaenids

Lauriids

Vertiginids

Trissexodontids

Helicids

Species

Subspecies

Hemicycla glyceia silensis

Hygromiids

Species

Subspecies

Leptaxis simia portosancti

Chondrinids

Enids

Other Stylommatophora

Species

Subspecies

Littorinimorpha

There are 323 species and seven subspecies in the order Littorinimorpha assessed as vulnerable.

Hydrobiids

Species

Subspecies

Bithyniids

Moitessieriids

Assimineids

Pomatiopsids

Other Littorinimorpha species

Sorbeoconcha

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

Pleurocerids

Melanopsids

Thiarids

Pachychilids

Paludomids

Architaenioglossa

Species

Subspecies

Hygrophila

Species

Subspecies

Gyraulus connollyi exilis

Neogastropoda

There are 27 species in the order Neogastropoda assessed as vulnerable.

Conids

Other Gastropoda species

Zospeum biscaiense
Zospeum exiguum

Bivalvia

There are 48 species and two subspecies in the class Bivalvia assessed as vulnerable.

Unionoida

There are 36 species and two subspecies in the order Unionoida assessed as vulnerable.

Margaritiferids

Margaritifera middendorffi

Unionids

Species

Subspecies

Lampsilis reeviana reeviana

Hyriids

Iridinids

Species

Subspecies

Chambardia wahlbergi guillaini

Arcoida

Scaphula nagarjunai

Veneroida

Cephalopods

Cnidaria

There are 204 species in the phylum Cnidaria assessed as vulnerable.

Hydrozoa

Anthozoa

There are 202 species in the class Anthozoa assessed as vulnerable.

Scleractinia

There are 199 species in the order Scleractinia assessed as vulnerable.

Euphyllids

Dendrophylliids

Acroporids

Poritids

Brain corals

Pocilloporids

Mussids

Agariciids

Other Scleractinia species

Other Anthozoa species

Arthropods

There are 1031 arthropod species and 29 arthropod subspecies assessed as vulnerable.

Centipedes

Serpent Island centipede

Seed shrimps

Arachnids

There are 47 arachnid species assessed as vulnerable.

Spiders

Other arachnid species

Branchiopoda

Millipedes

Maxillopoda

There are 71 species in the class Maxillopoda assessed as vulnerable. Maxillopoda includes barnacles, copepods and a number of related animals.

Calanoida

There are 47 species in the order Calanoida assessed as vulnerable.

Diaptomids

Centropagids

Temorids

Epischura baikalensis

Cyclopoida

Harpacticoida

There are 18 species in the order Harpacticoida assessed as vulnerable.

Darcythompsoniids

Leptocaris stromatolicolus

Ameirids

Canthocamptids

Malacostracans

There are 306 malacostracan species and 14 malacostracan subspecies assessed as vulnerable. Malacostraca includes crabs, lobsters, crayfish, shrimp, krill, woodlice, and many others.