As of July 2016, the

International Union for Conservation of Nature The International Union for Conservation of Nature (IUCN) is an international organization working in the field of nature conservation and sustainable use of natural resources. Founded in 1948, IUCN has become the global authority on the stat ...

(IUCN) lists 395 extinct species, 206 possibly extinct species, 15 extinct in the wild species, 8 extinct subspecies, and 5 extinct in the wild subspecies of invertebrate.

Flatworms

Extinct species * Lake Pedder planarian ''(Romankenkius pedderensis)''

Nemertea Nemertea is a phylum of animals also known as ribbon worms or proboscis worms, consisting of about 1300 known species. Most ribbon worms are very slim, usually only a few millimeters wide, although a few have relatively short but wide bodies. ...
species

Extinct species *'' Geonemertes rodericana'' Possibly extinct species *'' Prosadenoporus agricola''

Annelids The annelids (), also known as the segmented worms, are animals that comprise the phylum Annelida (; ). The phylum contains over 22,000 extant species, including ragworms, earthworms, and leeches. The species exist in and have adapted to vario ...

Extinct species *Japan's earthworm ''( Amynthas japonicus)'' *Schmarda's earthworm ''(Tokea orthostichon)'' * Lake Pedder earthworm ''(Hypolimnus pedderensis)''

Molluscs Mollusca is a phylum of protostome, protostomic invertebrate animals, whose members are known as molluscs or mollusks (). Around 76,000 extant taxon, extant species of molluscs are recognized, making it the second-largest animal phylum ...

Gastropods Gastropods (), commonly known as slugs and snails, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, freshwater, and from the land. Ther ...

Extinct species Possibly extinct species Extinct in the wild species Extinct subspecies Extinct in the wild subspecies

Bivalvia Bivalvia () or bivalves, in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class (biology), class of aquatic animal, aquatic molluscs (marine and freshwater) that have laterally compressed soft bodies enclosed b ...

Extinct species Possibly extinct species Extinct subspecies

Cnidaria Cnidaria ( ) is a phylum under kingdom Animalia containing over 11,000 species of aquatic invertebrates found both in fresh water, freshwater and marine environments (predominantly the latter), including jellyfish, hydroid (zoology), hydroids, ...

Possibly extinct species *'' Millepora boschmai'' * Wellington's solitary coral ''(Rhizopsammia wellingtoni)''

Arthropods Arthropods ( ) are invertebrates in the phylum Arthropoda. They possess an arthropod exoskeleton, exoskeleton with a cuticle made of chitin, often Mineralization (biology), mineralised with calcium carbonate, a body with differentiated (Metam ...

Centipedes Centipedes (from Neo-Latin , "hundred", and Latin language, Latin , "foot") are predatory arthropods belonging to the class Chilopoda (Ancient Greek , ''kheilos'', "lip", and Neo-Latin suffix , "foot", describing the forcipules) of the subphyl ...

Possibly extinct species *'' Mecistocephalus cyclops'' *'' Mecistocephalus sechellarum''

Seed shrimps

Extinct species *'' Liocypris grandis''

Arachnids Arachnids are arthropods in the class Arachnida () of the subphylum Chelicerata. Arachnida includes, among others, spiders, scorpions, ticks, mites, pseudoscorpions, harvestmen, camel spiders, whip spiders and vinegaroons. Adult arachnids ...

Extinct species Possibly extinct species

Millipedes Millipedes (originating from the Latin , "thousand", and , "foot") are a group of arthropods that are characterised by having two pairs of jointed legs on most body segments; they are known scientifically as the class Diplopoda, the name derive ...

Extinct species Possibly extinct species

Entognatha The Entognatha, from Ancient Greek ἐντός (''entós''), meaning "inside", and γνάθος (''gnáthos''), meaning "jaw", are a class (biology), class of wingless and Ametabolism, ametabolous arthropods, which, together with the insects, ...

Possibly extinct species *'' Ceratophysella sp. nov. 'HC''' *'' Delamarephorura tami''

Maxillopoda

Extinct species *'' Afrocyclops pauliani'' *'' Tropodiaptomus ctenopus''

Malacostraca Malacostraca is the second largest of the six classes of pancrustaceans behind insects, containing about 40,000 living species, divided among 16 orders. Its members, the malacostracans, display a great diversity of body forms and include crab ...
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Extinct species Possibly extinct species Extinct in the wild species *

Socorro isopod ''Thermosphaeroma thermophilum'' is a crustacean in the family Sphaeromatidae. It is commonly known as the Socorro isopod or Socorro sowbug. It was endemic to the thermal water of Sedillo Spring, located in Socorro County, New Mexico. Harriet ...

''(Thermosphaeroma thermophilum)''

Insects Insects (from Latin ') are hexapod invertebrates of the class Insecta. They are the largest group within the arthropod phylum. Insects have a chitinous exoskeleton, a three-part body (head, thorax and abdomen), three pairs of jointed ...

Extinct species Possibly extinct species Extinct in the wild species * Oahu deceptor bush cricket ''(Leptogryllus deceptor)''

References

*Invertebrates Recently extinct invertebrates {{bots, deny=BG19bot,Yobot