Ancistrus is a genus of nocturnal freshwater fish in the family Loricariidae of order Siluriformes, native to freshwater habitats in South America and Panama. Fish of this genus are common in the aquarium trade where they are known as bushynose or bristlenose catfish. In the aquarium hobby they are often referred to as bushynose or bristlenose plecos instead, but this may lead to confusion as "pleco" usually is used for Hypostomus plecostomus and its allies and is often used as a catchall term for any loricariids remotely resembling that species.
The Mastigoteuthidae, also known as whip-lash squid, are a family of small deep-sea squid. Approximately 20 known species in six genera are represented, with members found in both the mesopelagic and bathypelagic zone of most oceans. Originally described by Verill in 1881, it was later lowered by Chun (1920) to a subfamily (Mastigoteuthinae) of the Chiroteuthidae. However, Roper et al. (1969) raised it back to the family level, and this has not been changed since. The taxonomy of this family is extremely unstable, and there have been at times one genus, two genera and four subgenera(Salcedo-Vargas & Okutani, 1994), two genera and several 'groups', five genera and one species with an uncertain placement, or six genera.
Cordylancistrus is a genus of suckermouth armored catfish native to South America. It is much the same as Chaetostoma. The few differences are a wider head, longer cheek odontodes, and plates on the snout. Cordylancistrus can be found in rivers and streams high in the Andes, from Venezuela to Colombia.
Pseudancistrus is a genus of suckermouth armored catfishes native to South America.
Hypancistrus is a genus of loricariid catfish originating from the Amazon basin in South America. Unlike many of the other Loricariids, however, some Hypancistrus species are more carnivorous and enjoy meat in their diet. Hypancistrus species are popular aquarium fish, including such popular fish as the zebra pleco and Queen Arabesque pleco.
Peckoltia is a genus of small South American armored suckermouth catfishes. Many of these fish are popular aquarium fish.
Hemiancistrus is a genus of suckermouth armored catfishes. These species are native to South America. The taxonomy of this genus is complex and unclear, and major work has to be done. Many of these fish are popular aquarium fish.
The Hypostominae are a subfamily of catfishes of the family Loricariidae. Most members are restricted to tropical and subtropical South America, but there are also several species in southern Central America. Hypostomus plecostomus, which is popular in the aquarium trade, has been introduced to several regions far from its native range.
Ancistrini is a tribe of catfishes of the family Loricariidae. Most are restricted to tropical and subtropical South America, but there are also several genus in southern Central America.
Chirostoma is a genus of Neotropical silversides from the Lerma River basin in Mexico, including lakes Chapala and Pátzcuaro. Fish in the genus collectively go by the common name charal/charales in their native range. They are heavily fished, but several of the species have become threatened due to habitat loss, introduced species and overfishing. Three species are considered extinct: C. bartoni, C. charari (1957) and C. compressum (1900). Four others have not been recorded recently and may also be extinct.
Chaetostoma, also known as the bristlemouth catfish, is a genus of suckermouth armored catfishes native to South America with one species, C. fischeri, extending into Panama. Most species inhabit flowing rivers in the lower Andes and its foothills. Some species are kept in unheated aquaria.
Chaetostoma carrioni is a species of armored catfish from South America. These fish reach 7.8 centimetres (3.1 in) SL. These fish are demersal and live in tropical, freshwater habitats. They are found in the Marañón River basin in Ecuador.
Chaetostoma lexa is a species of armored catfish only known from streams and rivers that feed into the Huallaga River near Tingo María, Leoncio Prado Province, Peru. This species grows to a length of 4.89 centimetres (1.93 in) SL. The genus Loraxichthys is a synonym of Chaetostoma.
Transancistrus is a genus of suckermouth armored catfishes native to South America.
Yaluwak is a genus of armored catfish native to South America where they are only known from Guyana, containing only a single species Yaluwak primus. It was first described in a 2020 study and placed within the tribe Ancistrini.
Andeancistrus eschwartzae is a species of catfish in the family Loricariidae. It is a freshwater fish native to South America, where it occurs in the Amundalo River, which is part of the Pastaza River drainage basin in Ecuador. The species reaches 14.4 cm SL and it is named after Eugenia Schwartz, who is noted to have supported the research needed to describe the species.
Andeancistrus platycephalus is a species of catfish in the family Loricariidae. It is native to South America, where it occurs in the Zamora River basin, which is part of the upper Marañón River drainage in Ecuador. The species can reach 14.5 cm (5.7 in) in total length. The species was in the genus Cordylancistrus until a 2015 reclassification, when Nathan K. Lujan, Vanessa Meza-Vargas, and Ramiro Barriga-Salazar constructed the genera Andeancistrus and Transancistrus.
Chaetostoma bifurcum is a species of catfish in the family Loricariidae. It is a freshwater fish native to South America, where it is found in the Pacific coastal drainages of Ecuador and Peru, including the basins of the Esmeraldas River, the Guayas River, the Santa Rosa River, and the Tumbes River. It inhabits regions of foothills at an elevation of 100 to 650 m above sea level. The species reaches 14 cm SL.
Chaetostoma trimaculineum is a species of catfish in the family Loricariidae. It is native to South America, where it occurs in the drainage basins of the Santiago River and the Marañón River in Ecuador and Peru. The species reaches 16 cm SL.
Chaetostoma spondylus is a freshwater species of catfish in the family Loricariidae and the genus Chaetostoma. It is a demersal fish with a pH range of about 6–7.1. It is native to South America, where it occurs in the Chotano River, the Huancabamba River, the Sendamal River, and the Utcubamba, which are mountain tributaries of the Marañón River located at around 1500 to 2000 meters above sea level. These rivers are, by extension, part of the Amazon River basin in Peru.
