Gymnocorymbus is a genus of freshwater ray-finned fishes belonging to the family Acestrorhamphidae, the American characins. The fishes in this genus are found in 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 molecular phylogeny of Gymnocorymbus Eigenmann, 1908 (Teleostei, Characiformes, Characidae). Zootaxa, 3956 (1): 1-28. These tetras are popular in the aquarium trade.
Species Gymnocorymbuscontains the followjng valid species: Gymnocorymbus bondi (Fowler, 1911) Gymnocorymbus flaviolimai Benine, B. F. de Melo, R. M. C. Castro & C. de Oliveira, 2015 Gymnocorymbus ternetzi (Boulenger, 1895) (Black tetra) Gymnocorymbus thayeri C. H. Eigenmann, 1908 (False black tetra)
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