Ancistrus hoplogenys is a species of armored catfish native to Argentina, Brazil, Guyana, Paraguay, Peru, and Uruguay, where it occurs in the basins of the Amazon River, the Essequibo River, and the Paraguay River. It has also been reported from Suriname. This species grows to a length of 15.8 centimetres (6.2 in) SL. In the aquarium hobby, this fish is sometimes known as the spotted or starlight bristlenose pleco, although it may also be referred to by its L-number, which is L059.
Ancistrus caucanus is a species of catfish in the family Loricariidae. It is native to South America, where it was at one point thought to occur in the Cauca River basin in Colombia, for which it is named, although subsequent research suggested in 2013 that it is actually native to the Magdalena River basin, whereas its congener Ancistrus vericaucanus is the species native to the Cauca. The species reaches 5.2 cm SL. It is not to be confused with the similarly named species Lasiancistrus caucanus.
Ancistrus centrolepis is a species of catfish in the family Loricariidae. It is a freshwater species native to South America, where it occurs in coastal drainages of the northern Andes, including the Atrato River, Baudó River, and San Juan River basins in Colombia. The species reaches 18.4 cm SL.
Ancistrus bolivianus is a species of catfish in the family Loricariidae. It is native to South America, where it occurs in the basins of the Beni River, the Mamoré River, and the Madre de Dios River. The species reaches 8.8 cm SL.
Ancistrus aguaboensis is a species of catfish in the family Loricariidae. It is native to South America, where it is known from the upper Tocantins River basin. The area in which the species occurs is characterized by riffles and a primarily rocky substrate, although some amounts of gravel and sand are present. The species reaches 6.7 cm SL. It sometimes appears in the aquarium trade, where it is usually either known as the Aguaboa ancistrus, the Aguaboa pleco, or by its L-number, L032.
Ancistrus jelskii is a species of catfish in the family Loricariidae. It is native to the upper Tulumayo River basin, which is part of the Ucayali River system in Peru. The species reaches 8 cm in total length.
Ancistrus gymnorhynchus is a species of catfish in the family Loricariidae. It is a freshwater species native to South America, where it occurs in the upper Pao River basin in the Orinoco drainage, as well as in coastal rivers of the states of Carabobo and Yaracuy in Venezuela. The species reaches 14.2 cm SL and it is known to feed on algae, which it has been noted to be very efficient at removing.
Ancistrus latifrons is a species of catfish in the family Loricariidae. It is native to South America, where it occurs in the basins of the Amazon River and the Solimões River. The species reaches 15.4 cm SL.
Ancistrus fulvus is a species of catfish in the family Loricariidae. It is native to South America, where it occurs in the Acará River basin in the lower Amazon River drainage in Brazil. The species reaches 8.8 cm SL.
Ancistrus multispinis is a species of catfish in the family Loricariidae. It is native to South America, where it occurs in the Atlantic coastal drainage of eastern Brazil, ranging from the Macacu River to the Maquiné River. The species reaches 14.2 cm SL. The species has nocturnal habits and has been used in studies on the impacts of deltamethrin on fish blood in Brazil.
Ancistrus tamboensis is a species of catfish in the family Loricariidae. It is native to South America, where it occurs in the Tambo River basin in the Ucayali River drainage of Peru. The species reaches 8.2 cm SL and is named for the river basin in which it occurs.
Ancistrus nudiceps is a species of catfish in the family Loricariidae. It is native to South America, where it occurs in the Takutu River basin in the upper Branco River drainage in Guyana. The species reaches 7.9 cm SL.
Ancistrus occidentalis is a species of catfish in the family Loricariidae. It is native to South America, where it occurs in the Bobonaza River basin in Ecuador. The species reaches 8.6 cm SL.
Ancistrus bufonius is a species of catfish in the family Loricariidae. It is native to South America, where it occurs in the Apurímac River basin in Peru. The species reaches 11.5 cm SL.
Ancistrus brevifilis is a species of catfish in the family Loricariidae. It is a freshwater fish native to South America, where it occurs in the Tuy River basin in Venezuela. The species reaches 11.8 cm SL.
Ancistrus dubius is a species of catfish in the family Loricariidae. It is native to South America, where it occurs in the basins of the Amazon River, the Paraná River, and the Paraguay River. The species reaches 12.6 cm SL.
Ancistrus lineolatus, also known as the Bristlenose Catfish is a species of catfish in the family Loricariidae. It is native to South America, where it occurs in the Orteguaza River basin, which is part of the Japurá River drainage in Colombia.
Ancistrus maracasae is a species of catfish in the family Loricariidae. It is a freshwater fish native to the Caribbean, where it occurs in the basin of the Maracas River, which is a major tributary of the Caroni River in Trinidad and Tobago, indicating that it is endemic to the island of Trinidad. The species reaches 8.3 cm SL.
Ancistrus megalostomus is a species of catfish in the family Loricariidae. It is native to South America, where it occurs in the Beni River basin, which is part of the Madeira River drainage in Bolivia. The species reaches 8.3 cm SL and is noted to inhabit high-altitude environments.
Ancistrus taunayi is a species of catfish in the family Loricariidae. It is native to South America, where it occurs in the Uruguay River basin. The species reaches 11.9 cm SL and at least 52.3 g in weight.
