As of July 2016, the International Union for Conservation of Nature (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 species
Extinct species
Geonemertes rodericana
Possibly extinct species
Prosadenoporus agricola
Annelids
Extinct species
Japan's earthworm (Amynthas japonicus) Schmarda's earthworm (Tokea orthostichon)
Lake Pedder earthworm (Hypolimnus pedderensis)
Molluscs
Gastropods
Extinct species
Possibly extinct species
Extinct in the wild species
Extinct subspecies
Extinct in the wild subspecies
Bivalvia
Extinct species
Possibly extinct species
Extinct subspecies
Cnidaria
Possibly extinct species
Millepora boschmai
Wellington's solitary coral (Rhizopsammia wellingtoni)
Arthropods
Centipedes
Possibly extinct species
Mecistocephalus cyclops
Mecistocephalus sechellarum
Seed shrimps
Extinct species
Liocypris grandis
Namibcypris costata
Arachnids
Extinct species
Possibly extinct species
Millipedes
Extinct species
Possibly extinct species
Entognatha
Possibly extinct species
Ceratophysella sp. nov. 'HC'
Delamarephorura tami
Maxillopoda
Extinct species
Afrocyclops pauliani
Tropodiaptomus ctenopus
Malacostracans
Extinct species
Possibly extinct species
Extinct in the wild species
Socorro isopod (Thermosphaeroma thermophilum)
Insects
Extinct species
Possibly extinct species
Extinct in the wild species
Oahu deceptor bush cricket (Leptogryllus deceptor)