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. 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. 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".
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 Prosadenoporus agricola (possibly extinct)
Annelids Mesonerilla prospera
Onychophora
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 Henrigirardia wienini (possibly extinct) Spiralix corsica (possibly extinct)
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 Bulinus tropicus torensis
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 Margaritifera margaritifera durrovensis
Etheriids Acostaea rivolii
Unionids
Species
Subspecies
Hyriids Glenelg freshwater mussel (Hyridella glenelgensis)
Venerida
Sphaeriida Euglesa maasseni
Cephalopods Roughy umbrella octopus (Opisthoteuthis chathamensis)
Cnidaria
Anthozoa
Hydrozoa
Arthropods
There are 394 arthropod species and three arthropod subspecies assessed as critically endangered. Centipedes
Seed shrimps Kapcypridopsis barnardi Spelaeoecia bermudensis
Arachnids There are 47 arachnid species assessed as critically endangered. Harvestmen
Spiders
Other arachnid species
Branchiopoda
Millipedes
Entognatha Ceratophysella sp. nov. 'HC' (possibly extinct) Delamarephorura tami (possibly extinct)
Maxillopoda
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
Isopods
Amphipods
Decapods There are 106 decapod species and one decapod subspecies assessed as critically endangered. Parastacids
Gecarcinucids
Atyids
Cambarids
Species
Subspecies Procambarus rogersi expletus
Palaemonids
Other decapod species
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
Beetles
Odonata
Species
Subspecies 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
References