Trachydoras microstomus is a species of thorny catfish that is native to Bolivia, Brazil, Colombia, Guyana, Peru and Venezuela. It occurs in the Essequibo, Orinoco and Amazon basins. This species grows to a length of SL. References Doradidae Freshwater fish of Brazil Fish of Bolivia Freshwater fish of Colombia Fish of Guyana Freshwater fish of Peru Fish of Venezuela Fish described in 1912 Taxa named by Carl H. Eigenmann