''Gymnocorymbus'' is a genus of small

characin Characiformes is an order of ray-finned fish, comprising the characins and their allies. Grouped in 18 recognized families, more than 2000 different species are described, including the well-known piranha and tetras.; Buckup P.A.: "Relationshi ...

s from the Amazon, Paraguay,

Orinoco The Orinoco () is one of the longest rivers in South America at . Its drainage basin, sometimes known as the Orinoquia, covers , with 76.3 percent of it in Venezuela and the remainder in Colombia. It is the fourth largest river in the wor ...

Courantyne The Courantyne/Corentyne/Corantijn River is a river in northern South America in Suriname and Guyana. It is the longest river in the country and creates the border between Suriname and the East Berbice-Corentyne region of Guyana. Its tributa ...

, Gurupí and

Parnaíba Parnaíba () is a city in the Brazilian state of Piauí. Having a population of over 150,000 inhabitants according to IBGE's 2020 report, it is the second most populous city in the state, after the capital Teresina. It is one of the four coastal ...

river basins in South America.Benine, R.C., Melo, B.F., Castro, R.M.C. & Oliveira, C. (2015): Taxonomic revision and molecular phylogeny of ''Gymnocorymbus'' Eigenmann, 1908 (Teleostei, Characiformes, Characidae). ''Zootaxa, 3956 (1): 1-28.'' These tetras are popular in the

aquarium An aquarium (plural: ''aquariums'' or ''aquaria'') is a vivarium of any size having at least one transparent side in which aquatic plants or animals are kept and displayed. Fishkeepers use aquaria to keep fish, invertebrates, amphibians, aq ...

trade.

Species

There are currently 4 recognized species in this genus: * ''

Gymnocorymbus bondi ''Gymnocorymbus'' is a genus of small characins from the Amazon, Paraguay, Orinoco, Courantyne, Gurupí and Parnaíba river basins in South America.Benine, R.C., Melo, B.F., Castro, R.M.C. & Oliveira, C. (2015): Taxonomic revision and molec ...

'' ( Fowler, 1911) * '' Gymnocorymbus flaviolimai'' Benine, B. F. de Melo, R. M. C. Castro & C. de Oliveira, 2015 * ''

Gymnocorymbus ternetzi The black tetra (''Gymnocorymbus ternetzi''), also known as the black skirt tetra, petticoat tetra, high-fin black skirt tetra, black widow tetra and blackamoor, is a freshwater fish of the characin family (Characidae). It is native to the Parag ...

'' (

Boulenger Boulenger is a surname. Notable people with the surname include: * Benjamin Boulenger (born 1990), French footballer * Edward George Boulenger (1888–1946), British zoologist, director of aquarium at London Zoo * George Albert Boulenger (1858–1 ...

, 1895) (Black tetra) * ''

Gymnocorymbus thayeri ''Gymnocorymbus'' is a genus of small characins from the Amazon, Paraguay, Orinoco, Courantyne, Gurupí and Parnaíba river basins in South America.Benine, R.C., Melo, B.F., Castro, R.M.C. & Oliveira, C. (2015): Taxonomic revision and molec ...

'' C. H. Eigenmann, 1908 (False black tetra)

References

Characidae Fish of South America Taxa named by Carl H. Eigenmann {{Characiformes-stub