List of endangered 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))

Endangered (EN) species are considered to be facing a very high risk of extinction in the wild.

As of February 2016, the International Union for Conservation of Nature (IUCN) lists 1119 endangered invertebrate species.^[1] 6.4% of all evaluated invertebrate species are listed as endangered. The IUCN also lists 36 invertebrate subspecies as endangered.

No subpopulations of invertebrates have been evaluated by the IUCN.

For a species to be considered endangered by the IUCN it must meet certain quantitative criteria which are designed to classify taxa facing "a very high risk of exintction". An even higher risk is faced by critically endangered species, which are listed separately (List of critically endangered invertebrates) even though they also meet the quantitative criteria for endangered species. There are 2080 invertebrate species which are endangered or critically endangered.

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 endangered 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.

Molluscs

There are 503 mollusc species and nine mollusc subspecies assessed as endangered.

Gastropoda

There are 444 species and seven subspecies in the class Gastropoda assessed as endangered.

Stylommatophora

There are 185 species and two subspecies in the order Stylommatophora assessed as endangered. Stylommatophora includes the majority of land snails and slugs.

Partulids

Achatinellids

Endodontids

Charopids

Helicarionids

Orthalicids

Species

Subspecies

Stock Island tree snail

Euconulids

Streptaxids

Species

Subspecies

Tayloria urguessensis subangulata

Camaenids

Helicids

Hygromiids

Other Stylommatophora species

Littorinimorpha

There are 147 species and three subspecies in the order Littorinimorpha assessed as endangered.

Hydrobiids

Bithyniids

Species

Subspecies

Other Littorinimorpha species

Sorbeoconcha

Architaenioglossa

Species

Subspecies

Hygrophila

There are 22 species in Hygrophila assessed as endangered.

Planorbids

Lymnaeids

Neogastropoda

Other Gastropoda species

Bivalvia

There are 57 species and two subspecies in the class Bivalvia assessed as endangered.

Unionoida

There are 54 species and two subspecies in the order Unionoida assessed as endangered.

Unionids

Species

Subspecies

Other Unionoida species

Veneroida

Cephalopods

Cnidaria

There are 28 species in the phylum Cnidaria assessed as endangered.

Hydrozoa

Anthozoa

There are 26 species in the class Anthozoa assessed as endangered.

Sea pens

Crassophyllum thessalonicae

Actinaria

Paranemonia vouliagmeniensis

Scleractinia

Arthropods

There are 576 arthropod species and 27 arthropod subspecies assessed as endangered.

Centipedes

Arachnids

There are 70 arachnid species assessed as endangered.

Harvestmen

Spiders

Other arachnid species

Branchiopoda

Millipedes

Malacostracans

There are 170 malacostracan species and six malacostracan subspecies assessed as endangered. Malacostraca includes crabs, lobsters, crayfish, shrimp, krill, woodlice, and many others.