Brachychalcinus orbicularis
Brachychalcinus orbicularis, the discus tetra, is a species of freshwater ray-finned fish belonging to the famliy Acestrorhamphidae, the American characins. The discus tetra is found in South America in the Amazon and Orinoco basins, and the coastal rivers of the Guianas, being recorded from Bolivia, Brazil, Colombia, French Guiana, Guyana, Peru, Suriname and Venezuela. This species has a maximum standard length of.