A species that is extinct in the wild (EW) is one that has been categorized by the International Union for Conservation of Nature as known only by living members kept in captivity or as a naturalized population outside its historic range due to massive habitat loss.
Thaumatodon hystricelloides is a species of minute air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Endodontidae.
Thaumatodon is a genus of minute air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Endodontidae.
The Somali hedgehog is a species of mammal in the family Erinaceidae. It is endemic to Somalia and Somaliland. The Somali hedgehog is nocturnal.
The Javanese shrew is a species of mammal in the family Soricidae. It is endemic to Indonesia.
The pale gray shrew is a species of mammal in the family Soricidae. It is endemic to Pakistan. It is threatened by habitat loss.
Zarudny's rock shrew is a species of mammal in the family Soricidae. It is found in Afghanistan, Iran, and Pakistan.
The Caucasian shrew is a species of mammal in the family Soricidae. It is found in Armenia, Russia and Turkey.
The Lowe's shrew is a species of mammal in the family Soricidae. It is found in China, Myanmar, Thailand, and Vietnam.
Mesoperipatus is a monospecific genus of velvet worm in the Peripatidae family, containing a single species Mesoperipatus tholloni. It is found in Gabon. This species is listed as Data Deficient on the IUCN Red List.
Speleoperipatus is a monospecific genus of velvet worm in the Peripatidae family, containing the single species Speleoperipatus spelaeus.
Stygobromus is a genus of amphipod crustaceans that live in subterranean habitats. As well as a large number of species in North America, a smaller number of species are also known from Eurasia. Most of the North American species live in areas which were not covered by the Laurentide Ice Sheet, although a few species seem to have survived under the ice. A number of species are on the IUCN Red List as endangered species (EN) or vulnerable species (VU); all the listed species are endemic to the United States. One species, S. lucifugus, is extinct. Stygobromus includes the following species:
