''Gymnocorymbus'' is a

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

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.: "Relationsh ...

s from the

Amazon Amazon most often refers to: * Amazon River, in South America * Amazon rainforest, a rainforest covering most of the Amazon basin * Amazon (company), an American multinational technology company * Amazons, a tribe of female warriors in Greek myth ...

Paraguay Paraguay, officially the Republic of Paraguay, is a landlocked country in South America. It is bordered by Argentina to the Argentina–Paraguay border, south and southwest, Brazil to the Brazil–Paraguay border, east and northeast, and Boli ...

Orinoco The Orinoco () is one of the longest rivers in South America at . Its drainage basin, sometimes known as the Orinoquia, covers approximately 1 million km2, with 65% of it in Venezuela and 35% in Colombia. It is the List of rivers by discharge, f ...

, Courantyne, Gurupí and

Parnaíba Parnaíba () is a city in the Brazilian state of Piauí. Having a population of over 169,000 inhabitants according to IBGE's 2024 estimates, it is the second most populous city in the state, after the capital Teresina. It is one of the four coast ...

river basins in

South America South America is a continent entirely in the Western Hemisphere and mostly in the Southern Hemisphere, with a considerably smaller portion in the Northern Hemisphere. It can also be described as the southern Subregion#Americas, subregion o ...

.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

tetra Tetra is the common name of many small freshwater characiform fishes. Tetras come from Africa, Central America, and South America, belonging to the biological families Characidae, Alestidae (the "African tetras"), Lepidarchidae, Lebiasi ...

s are popular in the

aquarium An aquarium (: 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. fishkeeping, Fishkeepers use aquaria to keep fish, invertebrates, amphibians, aquati ...

trade.

Species

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

Gymnocorymbus bondi ''Gymnocorymbus'' is a genus of small characins from the Amazon basin, Amazon, Paraguay River, Paraguay, Orinoco, Courantyne River, Courantyne, Gurupí River, Gurupí and Parnaíba River, Parnaíba river basins in South America.Benine, R.C., Mel ...

'' ( 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 skirt tetra, black widow tetra and blackamoor, is a freshwater fish of the characin family (Characidae). It i ...

'' (

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– ...

, 1895) (Black tetra) * '' Gymnocorymbus thayeri'' C. H. Eigenmann, 1908 (False black tetra)

References

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