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As of July 2016, the International Union for Conservation of Nature (IUCN) lists 987 critically endangered invertebrate species, including 206 which are tagged as possibly extinct.[1][2] 5.5% of all evaluated invertebrate species are listed as critically endangered. The IUCN also lists 14 invertebrate subspecies as critically endangered.

16 extinct in the wild invertebrate species (0.09%)987 critically endangered invertebrate species (5.6%)1163 endangered invertebrate species (6.6%)2178 vulnerable invertebrate species (12%)1105 near threatened invertebrate species (6.3%)6919 least concern invertebrate species (39%)5278 data deficient invertebrate species (30%)
Invertebrate species (IUCN, 2020.1)
  • 17,646 extant species have been evaluated
  • 12,368 of those are fully assessed[lower-alpha 1]
  • 8024 are not threatened at present[lower-alpha 2]
  • 4328 to 9606 are threatened[lower-alpha 3]
  • 410 to 616 are extinct or extinct in the wild:
    • 395 extinct (EX) species[lower-alpha 4]
    • 15 extinct in the wild (EW)
    • 206 possibly extinct [CR(PE)]
    • 0 possibly extinct in the wild [CR(PEW)]
  1. excludes data deficient evaluations.
  2. NT, LR/cd, LC.
  3. Threatened comprises CR, EN and VU. Upper estimate additionally includes DD.
  4. Chart omits extinct (EX) species
Critically Endangered (CR) species face an extremely high risk of extinction in the wild.
Critically Endangered (CR) species face an extremely high risk of extinction in the wild.

No subpopulations of invertebrates have been evaluated by the IUCN.

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.[3] 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."[4]

This is a complete list of critically endangered invertebrate species and subspecies as evaluated by the IUCN. Species considered possibly extinct by the IUCN are marked as such.


Nemertea species



Annelids



Onychophora



Molluscs


14 extinct in the wild mollusc species (0.20%)581 critically endangered mollusc species (8.4%)507 endangered mollusc species (7.3%)879 vulnerable mollusc species (13%)535 near threatened mollusc species (7.7%)2437 least concern mollusc species (35%)1988 data deficient mollusc species (29%)
Mollusc species (IUCN, 2020.1)
  • 6941 extant species have been evaluated
  • 4953 of those are fully assessed[lower-alpha 1]
  • 2972 are not threatened at present[lower-alpha 2]
  • 1967 to 3955 are threatened[lower-alpha 3]
  • 324 to 441 are extinct or extinct in the wild:
    • 311 extinct (EX) species[lower-alpha 4]
    • 13 extinct in the wild (EW)
    • 117 possibly extinct [CR(PE)]
    • 0 possibly extinct in the wild [CR(PEW)]
  1. excludes data deficient evaluations.
  2. NT, LR/cd, LC.
  3. Threatened comprises CR, EN and VU. Upper estimate additionally includes DD.
  4. Chart omits extinct (EX) species
Main article: List of critically endangered molluscs

There are 581 mollusc species and 11 mollusc subspecies assessed as critically endangered.


Gastropods


There are 511 gastropod species and six gastropod subspecies assessed as critically endangered.


Stylommatophora

Stylommatophora includes the majority of land snails and slugs. There are 233 species and five subspecies in the order Stylommatophora assessed as critically endangered.


Amastrids


Partulids


Achatinellids


Endodontids

Species

Subspecies


Charopids


Helicarionids


Orthalicids


Rhytidids


Streptaxids


Lauriids


Helicids


Hygromiids


Enids


Other Stylommatophora species


Littorinimorpha

There are 181 species in the order Littorinimorpha assessed as critically endangered.


Hydrobiids


Cochliopids


Bithyniids


Moitessieriids


Assimineids


Pomatiopsids


Sorbeoconcha


Architaenioglossa

There are 48 species in the order Architaenioglossa assessed as critically endangered.


Cyclophorids


Diplommatinids


Viviparids


Other Architaenioglossa species


Cycloneritimorpha


Hygrophila

Species

Subspecies


Neogastropoda


Other gastropod species


Bivalvia


There are 69 species and five subspecies in the class Bivalvia assessed as critically endangered.


Unionida

There are 66 species and five subspecies in the order Unionoida assessed as critically endangered.


Margaritiferids

Species

Subspecies


Etheriids


Unionids

Species

Subspecies


Hyriids


Venerida


Cephalopods



Cnidaria



Arthropods


2 extinct in the wild arthropod species (0.02%)393 critically endangered arthropod species (4.1%)626 endangered arthropod species (6.6%)1081 vulnerable arthropod species (11%)398 near threatened arthropod species (4.2%)4080 least concern arthropod species (43%)2890 data deficient arthropod species (31%)
Arthropod species (IUCN, 2016-2)
  • 9470 extant species have been evaluated
  • 6580 of those are fully assessed[lower-alpha 1]
  • 4478 are not threatened at present[lower-alpha 2]
  • 2100 to 4990 are threatened[lower-alpha 3]
  • 83 to 169 are extinct or extinct in the wild:
    • 81 extinct (EX) species[lower-alpha 4]
    • 2 extinct in the wild (EW)
    • 86 possibly extinct [CR(PE)]
    • 0 possibly extinct in the wild [CR(PEW)]
  1. excludes data deficient evaluations.
  2. NT, LR/cd, LC.
  3. Threatened comprises CR, EN and VU. Upper estimate additionally includes DD.
  4. Chart omits extinct (EX) species
Main article: List of critically endangered arthropods

There are 394 arthropod species and three arthropod subspecies assessed as critically endangered.


Centipedes



Seed shrimps



Arachnids


There are 47 arachnid species assessed as critically endangered.


Harvestmen


Spiders


Other arachnid species


Branchiopoda



Millipedes



Entognatha



Maxillopoda


Includes barnacles, copepods and a number of related animals.


Malacostracans


Malacostraca includes crabs, lobsters, crayfish, shrimp, krill, woodlice, and many others. There are 125 malacostracan species and one malacostracan subspecies assessed as critically endangered.


Mysida


Mictaceans


Isopods


Amphipods


Decapods

There are 106 decapod species and one decapod subspecies assessed as critically endangered.


Parastacids


Gecarcinucids


Atyids


Cambarids

Species

Subspecies


Palaemonids


Other decapod species


Insects


1 extinct in the wild insect species (0.02%)195 critically endangered insect species (3.3%)343 endangered insect species (5.7%)608 vulnerable insect species (10%)301 near threatened insect species (5.0%)2843 least concern insect species (47%)1702 data deficient insect species (28%)
Insect species (IUCN, 2016.1)
  • 5993 extant species have been evaluated
  • 4291 of those are fully assessed[lower-alpha 1]
  • 3144 are not threatened at present[lower-alpha 2]
  • 1146 to 2848 are threatened[lower-alpha 3]
  • 59 to 105 are extinct or extinct in the wild:
    • 58 extinct (EX) species[lower-alpha 4]
    • 1 extinct in the wild (EW)
    • 46 possibly extinct [CR(PE)]
    • 0 possibly extinct in the wild [CR(PEW)]
  1. excludes data deficient evaluations.
  2. NT, LR/cd, LC.
  3. Threatened comprises CR, EN and VU. Upper estimate additionally includes DD.
  4. Chart omits extinct (EX) species
Main article: List of critically endangered insects

There are 195 insect species and two insect subspecies assessed as critically endangered.


Blattodea


Orthoptera

There are 72 species in the order Orthoptera assessed as critically endangered.


Euschmidtiids


Crickets


Acridids


Tettigoniids


Other Orthoptera species


Hymenoptera


Lepidoptera

Moths and butterflies


Beetles


Odonata

Includes dragonflies and damselflies.

Species

Subspecies


Other insect species


See also



References


  1. "IUCN Red List version 2016.1". The IUCN Red List of Threatened Species. International Union for Conservation of Nature and Natural Resources (IUCN). Retrieved 4 July 2016.
  2. "Table 9: Possibly Extinct and Possibly Extinct in the Wild Species (IUCN Red List version 2016-1)". The IUCN Red List of Threatened Species. Union for Conservation of Nature and Natural Resources (IUCN). Retrieved 4 July 2016.
  3. "Limitations of the Data". The IUCN Red List of Threatened Species. Union for Conservation of Nature and Natural Resources (IUCN). Retrieved 11 January 2016.
  4. "2001 Categories & Criteria (version 3.1)". The IUCN Red List of Threatened Species. Union for Conservation of Nature and Natural Resources (IUCN). Retrieved 11 January 2016.


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