Monotypic isopod genera

Phoratopus remex is a species of isopod crustaceans known from only two specimens, and first described in 1925 by Herbert Matthew Hale (1895–1963). It lives on the continental shelf at Encounter Bay and Fowlers Bay, South Australia. Unlike all other Isopods, it is placed in its own family, Phoratopodidae and suborder, Phoratopidea.

Antrolana lira, also known as The Madison Cave isopod, is a freshwater, cave-dwelling crustacean species. It is in the family Cirolanidae and it is the only species of its genus Antrolana. This isopod can be found in flooded limestone caves and karst aquifers throughout the Great Appalachian Valley of Virginia and West Virginia. The Madison Cave isopod has been listed as a vulnerable species on the IUCN Red List since 1983 and as a threatened species under the United States Endangered Species Act since 1982. The species was named after the cave in which it was first discovered, Madison Saltpet

Remasellus parvus, the swimming Florida cave isopod, is an isopod endemic to 4 caves in the Ochlockonee and Aucilla-Suwanee drainages of Florida, United States. It is the only species in the genus Remasellus.

Annobodillo is a genus of woodlice belonging to the family Armadillidae. This genus was described in 1983 by Helmut Schmalfuss and Franco Ferrara. The type specimen for this species is an Annobodillo coecus from Annobón. There is currently only one species in this genus.

Asconiscus is a genus in the Asconiscidae family of marine isopod crustaceans in the suborder Cymothoida, containing a single genus and a single species, Asconiscus simplex. The original description of the family was made by Bonnier in 1900. A. simplex is a parasite of the shrimp-like crustacean, Boreomysis arctica.

Allobopyrus is a monotypic genus of Isopoda parasites, in the family Bopyridae. The only species is Allobopyrus rumphiusi.

Cubaroides is a genus of woodlice belonging to the family Armadillidae. This genus was described in 1973 by Albert Vandel. The type specimen for this species is a Cubaroides pilosus from New South Wales, and it is the only species in this genus.

Filippinodillo is a genus of woodlice belonging to the family Armadillidae. This genus was described in 1987 by Helmut Schmalfuss. The type specimen for this species is a Filippinodillo maculatus from Cebu island. There are currently four species in this genus.

Kimberleydillo is a genus of woodlice belonging to the family Armadillidae. This genus was described in 1993 by Henri Dalens. The type specimen for this species is a Kimberleydillo waldockae from Tunnel Creek cave in Western Australia and it is the only species in this genus.

Formosillo is a genus of woodlice belonging to the family Armadillidae. This genus was described in 1928 by Karl Wilhelm Verhoeff. The type specimen for this species is a Formosillo zimmeri from Taiwan and it is currently the only species in this genus.

Barrowdillo is a genus of woodlice belonging to the family Armadillidae. This genus was described in 1933 by Henri Dalens. The type specimen for this species is a Barrowdillo pseudopyrgoniscus from Barrow Island (Western Australia), and it is the only species in this genus.

Anthrodillo is a genus of woodlice belonging to the family Armadillidae. This genus was described in 1946 by Karl Wilhelm Verhoeff. The type specimen for this species is an Anthrodillo perkeo from Myanmar and it is currently the only species in this genus.

Anacepon is a monotypic genus of Isopoda parasites, in the family Bopyridae, that can be found on the coast of Indonesia. The only species is Anacepon sibogae.

Aulacodillo is a genus of woodlice belonging to the family Armadillidae. This genus was described in 1942 by Karl Wilhelm Verhoeff. The type specimen for this species is an Aulacodillo thomseni from a farm in Namibia, and it is the only species in this genus.

Pseudolobodillo is a genus of woodlice belonging to the family Armadillidae. The genus and the species were described in 1983 by Helmut Schmalfuss and Franco Ferrara.

Mexilana saluposi is a species of crustacean in the family Cirolanidae, the only species in the genus Mexilana. It is endemic to Mexico.

Keuphylia is a monotypic genus of crustaceans belonging to the monotypic family Keuphyliidae. The only species is Keuphylia nodosa.

Mictosoma is a monotypic genus of crustaceans belonging to the monotypic family Mictosomatidae. The only species is Mictosoma ramosum.