Loricariidae is the largest family of catfish, with 92 genera and just over 680 species. Loricariids originate from freshwater habitats of Costa Rica, Panama, and tropical and subtropical South America. These fish are noted for the bony plates covering their bodies and their suckermouths. Several genera are sold as "plecos", notably the suckermouth catfish, Hypostomus plecostomus, and are popular as aquarium fish.
Sisoridae is a family of catfishes. These Asian catfishes live in fast-moving waters and often have adaptations that allow them to adhere to objects in their habitats. The family includes about 235 species.
The Anchariidae are a family of catfishes containing two genera, Ancharius and Gogo with 6 species. Anchariids are a strictly freshwater group endemic to Madagascar. Anchariids are characterized by the presence of fringed barbels and a reduced anterior nuchal plate.
Zungaropsis is a genus of catfish of the family Pimelodidae. It is a monotypic genus, containing only the single species Zungaropsis multimaculatus, and is considered closely related to Zungaro. In 2003, Zungaropsis was considered as a genus inquirendum of the Pimelodidae.
Sisoroidea is a superfamily of catfishes. It contains the four families Amblycipitidae, Akysidae, Sisoridae, and Erethistidae; many sources also include Aspredinidae. With Aspredinidae, this superfamily includes about 42 genera and 230 species.
Eremophilus mutisii is a species of catfish of the family Trichomycteridae, and the only member of its genus. This fish grows to about 30 centimetres (12 in) and originates from the Bogotá River basin, which is a tributary of the Magdalena River. It has probably been introduced to Ubaté, Chiquinquirá, and Tundama valleys, Colombia.
Haemomaster venezuelae is a species of catfish of the family Trichomycteridae, and the only species of the genus Haemomaster. This fish grows to about 6.6 centimetres (2.6 in) SL and originates from the Amazon and Orinoco River basins.
Hatcheria macraei is a species of pencil catfish and the only species in its genus. This fish grows to about 20.8 centimetres (8.2 in) and originates from rivers east of the Andes in Argentina, between 29° and 45°30′S.
Megalocentor echthrus is a species of catfish of the family Trichomycteridae, and the only species of the genus Megalocentor. This fish grows to about 8.8 centimetres (3.5 in) SL and originates from the Amazon and Orinoco basins.
Pareiodon microps is a species of catfish of the family Trichomycteridae, and the only species of the genus Pareiodon. It is endemic to Brazil where it occurs in the Amazon Basin.
Hemiodontichthys acipenserinus is the only species of the monotypic genus Hemiodontichthys, a genus of the family Loricariidae of catfish.
Gogo is a small genus of catfishes of the family Anchariidae. It includes four species.
Pseudotatia parva is a species of catfish of the family Auchenipteridae. It is the only species of the genus Pseudotatia. This species originates from the São Francisco River basin of Brazil.
Uegitglanis zammaranoi is the only species of catfish in the genus Uegitglanis of the family Clariidae. It is endemic to Somalia, where it only occurs in caves near the Jubba and the Shebelle Rivers. This species grows to about 10.1 cm (4.0 in) in total length.
Galeichthys is a genus of sea catfishes in the family Ariidae, the only genus in the subfamily Galeichthyinae. It includes four predominantly marine species distributed in Southern Africa and northwestern South America:
Goeldiella eques is a species of three-barbeled catfish that occurs in the Guianas and the Amazon basin of Brazil, Peru and Venezuela. This fish reaches a length of 28.9 centimetres (11.4 in) SL. It is the only species of its genus.
Batrachocephalus mino, the beardless sea catfish, is the only species of catfish in the genus Batrachocephalus of the family Ariidae. This species occurs in marine and brackish waters of Bay of Bengal, and parts of the western central Pacific, in coastal waters, estuaries, and lower reaches of rivers. It is distributed from Pakistan, India, Sri Lanka, Bangladesh, Myanmar, Malaysia, Thailand, to Indonesia.
Platytropius siamensis was a species of schilbid catfish family Schilbeidae. It originated from the Chao Phraya and Bang Pakong Rivers in Thailand. It inhabited lower to middle reaches, mainstreams, tributaries, and larger marshlands. The species has been declared extinct in 2011 by the IUCN Red List of Threatened Species, because despite periodic surveys it has not been encountered since 1975–1977.
Ketengus typus, the bigmouth sea-catfish, is the only species in the sea catfish genus Ketengus.
Pareiorhina rudolphi is a species of armored catfish endemic to Brazil where it occurs in the Paraíba do Sul River near Lorena, São Paulo State, Brazil. This species grows to a length of 4.5 centimetres (1.8 in) TL.
