Nematocharax is a genus of freshwater fish in the family Characidae. It contains the single species Nematocharax venustus, which is endemic to Brazil, where it is found in the Jequitinhonha River basin. The males of this species can reach a length of SL while the females only grow to SL. References Monotypic fish genera Characidae Fish of South America Fish of Brazil Endemic fauna of Brazil Taxa named by Stanley Howard Weitzman Taxa named by Naércio Aquino de Menezes Taxa named by Heraldo Antonio Britski Fish described in 1986