Biology:List of endangered invertebrates

Short description: none

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

In July 2016, the International Union for Conservation of Nature (IUCN) listed 1163 endangered invertebrate species.^[1] Of all evaluated invertebrate species, 6.4% were 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 extinction". An even higher risk is faced by critically endangered species, which meet the quantitative criteria for endangered species. Critically endangered invertebrates are listed separately. There are 2150 invertebrate species which are endangered or critically endangered.

Additionally 5278 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.

Molluscs

There are 507 mollusc species and nine mollusc subspecies assessed as endangered.

Gastropods

There are 448 gastropod species and seven gastropod subspecies assessed as endangered.

Stylommatophora

Stylommatophora includes the majority of land snails and slugs. There are 187 species and two subspecies in the order Stylommatophora assessed as endangered.

Partulids

Achatinellids

Cerastids

Endodontids

Charopids

Helicarionids

Orthalicids

Species

Subspecies

Stock Island tree snail (Orthalicus reses reses)

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

Assimineids

Pomatiopsids

Other Littorinimorpha species

Sorbeoconcha

Architaenioglossa

Species

Subspecies

Bellamya unicolor abyssinicus
Maizania hildebrandti thikensis

Cycloneritimorpha

Hygrophila species

There are 22 Hygrophila species assessed as endangered.

Planorbids

Lymnaeids

Neogastropoda

Other gastropod species

Bivalvia

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

Unionida

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

Margaritiferids

Unionids

Species

Subspecies

Catspaw (Epioblasma obliquata obliquata)
Rough rabbitsfoot (Quadrula cylindrica strigillata)

Other Unionida species

Venerida

Cephalopods

Cnidaria

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

Hydrozoa

Millepora striata
Millepora tuberosa

Anthozoa

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

Sea pens

Crassophyllum thessalonicae

Actinaria

Paranemonia vouliagmeniensis

Scleractinia

Arthropods

There are 616 arthropod species and 27 arthropod subspecies assessed as endangered.

Centipedes

Arachnids

There are 72 arachnid species assessed as endangered.

Harvestmen

Spiders

Other arachnid species

Branchiopoda

Millipedes

Malacostracans

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