List of critically endangered invertebrates explained

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

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 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

• Prosadenoporus agricola (possibly extinct)

Annelids

• Mesonerilla prospera

Molluscs

See 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.

Endodontids

SpeciesSubspecies

Other Stylommatophora species

Littorinimorpha

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

Moitessieriids

• Henrigirardia wienini (possibly extinct)
• Spiralix corsica (possibly extinct)

Pomatiopsids

Architaenioglossa

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

Other Architaenioglossa species

Hygrophila

SpeciesSubspecies

• Bulinus tropicus torensis

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

SpeciesSubspecies

• Margaritifera margaritifera durrovensis

Etheriids

• Acostaea rivolii

Unionids

SpeciesSubspecies

Hyriids

• Glenelg freshwater mussel (Hyridella glenelgensis)

Venerida

Cephalopods

• Opisthoteuthis chathamensis

Arthropods

See main article: List of critically endangered arthropods. There are 394 arthropod species and three arthropod subspecies assessed as critically endangered.

Seed shrimps

• Kapcypridopsis barnardi
• Spelaeoecia bermudensis

Arachnids

There are 47 arachnid species assessed as critically endangered.

Other arachnid species

Entognatha

• Ceratophysella sp. nov. 'HC' (possibly extinct)
• Delamarephorura tami (possibly extinct)

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

• Bermudamysis speluncola
• Sterrer's cave mysid (Platyops sterreri)

Mictaceans

• Mictocaris halope

Decapods

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

Cambarids

SpeciesSubspecies

• Procambarus rogersi expletus

Other decapod species

Insects

See main article: List of critically endangered insects. There are 195 insect species and two insect subspecies assessed as critically endangered.

Orthoptera

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

Other Orthoptera species

Odonata

SpeciesSubspecies

• Chlorogomphus brunneus keramensis
• Delphi cordulegaster (Cordulegaster helladica kastalia)

Other insect species

See also

• Lists of IUCN Red List critically endangered species
• List of least concern invertebrates
• List of near threatened invertebrates
• List of vulnerable invertebrates
• List of endangered invertebrates
• List of recently extinct invertebrates
• List of data deficient invertebrates

Notes and References

1. Web site: IUCN Red List version 2016.1. The IUCN Red List of Threatened Species. International Union for Conservation of Nature and Natural Resources (IUCN). 4 July 2016.
2. Web site: 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). 4 July 2016.
3. Web site: Limitations of the Data. The IUCN Red List of Threatened Species. Union for Conservation of Nature and Natural Resources (IUCN). 11 January 2016.
4. Web site: 2001 Categories & Criteria (version 3.1). The IUCN Red List of Threatened Species. Union for Conservation of Nature and Natural Resources (IUCN). 11 January 2016.