List of critically endangered invertebrates

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.

• Prosadenoporus agricola (possibly extinct)

• Mesonerilla prospera

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

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

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

Species

Subspecies

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

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

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

Species

Subspecies

• Bulinus tropicus torensis

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

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

Species

Subspecies

• Margaritifera margaritifera durrovensis

• Acostaea rivolii

Species

Subspecies

• Glenelg freshwater mussel (Hyridella glenelgensis)

• Opisthoteuthis chathamensis

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

• Kapcypridopsis barnardi
• Spelaeoecia bermudensis

There are 47 arachnid species assessed as critically endangered.

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

Includes barnacles, copepods and a number of related animals.

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

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

• Mictocaris halope

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

Species

Subspecies

• Procambarus rogersi expletus

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

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

Moths and butterflies

Includes dragonflies and damselflies.

Species

Subspecies

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

• 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