Pseudancistrus is a genus of suckermouth armored catfishes native to South America.
Pseudancistrus sidereus is a species of armored catfish known only from the upper Orinoco basin in Amazonas state, Venezuela.
Peckoltia sabaji is a species of catfish in the family Loricariidae. It is native to South America, where it occurs in the basins of the Rupununi, the Essequibo River, and the Takutu River in Guyana, as well as the basins of the Casiquiare canal, the Rio Negro, the Cinaruco River, and the Orinoco in Venezuela. It is usually found among boulders in medium to large rivers. The species reaches 19.8 cm SL and is of disputed classification.
Ancistrus amaris is a species of catfish in the family Loricariidae. It is native to South America, where it occurs in the Orinoco River and Apure River basins in Venezuela. The species reaches at least 11.57 cm SL and was described in 2019 by Lesley S. de Souza of the Field Museum of Natural History, Donald C. Taphorn of the Royal Ontario Museum, and Jonathan Armbruster of Auburn University alongside five other species of Ancistrus. FishBase does not list this species.
Ancistrus trinitatis is a dubious species of catfish in the family Loricariidae. It is known only from the Caribbean, where it occurs in freshwater environments on the island of Trinidad in Trinidad and Tobago. This species is of uncertain validity, as Theodore Gill referred to the type material in 1858 as Ancistrus guacharote and it was later described by Albert Günther in 1864 as Chaetostomus trinitatis, but neither description is considered sufficient to determine the validity and identity of the taxon. While the original locality of the type material was listed as Puerto Rico, this was determined to be in error and the material was determined to have actually originated from the Maracaibo Basin of Venezuela. In 1946, Henry Weed Fowler described the species Ancistrus maracasae from Trinidad, and in 2019, Lesley S. De Souza, Donald C. Taphorn, and Jonathan W. Armbruster determined that A. maracasae and A. trinitatis are synonymous, designating the holotype of A. maracasae as the neotype of A. trinitatis, although sources such as FishBase and ITIS list the two species as valid but separate.
Chaetostoma platyrhynchus is a species of catfish in the family Loricariidae. It is native to South America, where it occurs in the Caquetá River basin in Colombia. The species reaches 9.5 cm in total length. The species is known to be of disputed classification and spelling.
Hemiancistrus guahiborum is a species of catfish in the family Loricariidae. It is native to South America, where it occurs in the Orinoco drainage in Venezuela. The species reaches at least 12.55 cm SL and was described in 2005 by David C. Werneke and Jonathan W. Armbruster of Auburn University, Nathan K. Lujan of the American Museum of Natural History, and Donald C. Taphorn of the Royal Ontario Museum on the basis of its distinctive coloration and morphology. It appears in the aquarium trade, where it is usually known either as the orange-seam pleco or by its L-number, which is L-106.
Peckoltia caenosa is a species of catfish in the family Loricariidae. It is native to South America, where it occurs in streams in the llanos of Venezuela that are part of the Orinoco drainage basin. The streams that it inhabits are typically slow-flowing and muddy, and the species is often seen hiding inside submerged hollow logs during the day. The species reaches 15.7 cm SL. Its specific epithet is derived from a Latin word meaning "muddy" or "dirty", referring both to the species' mottled coloration and the muddy habitats in which it is found.
Peckoltia wernekei is a species of catfish in the family Loricariidae. It is native to South America, where it occurs in the Ventuari River, which is a tributary of the Orinoco in the state of Amazonas in Venezuela. The species reaches at least 10.46 cm SL.
Pseudancistrus barbatus, commonly known as the bearded catfish, is a species of catfish in the family Loricariidae. It is native to South America, where it occurs in the basins of the Oyapock, the Mana River, the Maroni, the Suriname River, the Courantyne River, and the Essequibo River. Within its range, the bearded catfish is typically found in rocky, fast-flowing rapids.
Pseudancistrus coquenani is a species of catfish in the family Loricariidae. It is native to South America, where it occurs in the basin of the Cuquenán River, which itself is part of the upper Caroní River drainage in Venezuela. The species reaches 8.1 cm SL, and it is named for the river basin in which it is found.
Pseudancistrus guentheri is a species of catfish in the family Loricariidae. It is native to South America, where it was initially collected from an unknown locality in Guyana, although it has subsequently been reported from the confluence of the Mazaruni River and the Cuyuni River near the village of Kartabo. The species reaches 12 cm (4.7 in) in length.
Pseudancistrus zawadzkii is a species of catfish in the family Loricariidae. It is native to South America, where it occurs in the Tapajós basin, including the Tracuá River, in Brazil. It is typically found in areas with clear water, rocky outcrops, small waterfalls, and a substrate of rocks and sand. The species reaches 12.9 cm SL.
Pseudancistrus nigrescens is a species of catfish in the family Loricariidae. It is native to South America, where it occurs in the upper Potaro River basin in Guyana. The species reaches 18.2 cm in total length.
Pseudancistrus yekuana is a species of catfish in the family Loricariidae.
Pseudancistrus pectegenitor is a species of catfish in the family Loricariidae. It is native to South America, where it occurs in the main channel of the Orinoco near the mouth of the Ventuari River, as well as in the Casiquiare. The species is usually found in areas with flowing water near large rocky outcrops. It reaches 24.2 cm SL.
'Pseudancistrus' megacephalus is a species of catfish in the family Loricariidae. It is of uncertain and disputed classification.
Pseudancistrus papariae is a species of catfish in the family Loricariidae. It is native to South America, where it occurs in Lake Papari and the Jaguaribe River basin in Brazil. The species reaches 15.3 cm SL.
Pseudancistrus reus is a species of catfish in the family Loricariidae. It is native to South America, where it occurs in the Caroní River in Venezuela. It is typically found in presumably blackwater environments with low conductivity and a moderate current. The species reaches 7.7 cm SL. Its specific epithet, reus, is derived from Latin and translates to "prisoner", alluding to the species' barred patterning which resembles a stereotypical prison uniform.
Hypostomus hemicochliodon is a species of catfish in the family Loricariidae. It is native to South America, where it occurs in the Amazon River basin in Brazil, Ecuador, and Peru, as well as the Rio Negro and Orinoco drainage basins in Venezuela. The species reaches 36.2 cm in total length, can weigh up to at least 510 g, and is believed to be a facultative air-breather.
