Corumbataia britskii is a species of armored catfish endemic to Brazil where it is found in small tributaries of the Sucuriú River, upper Paraná River Basin in the state of Mato Grosso do Sul. This species was found in deforested areas in moderate to fast current streams. It associates with aquatic macrophytes or the submerged portion of marginal vegetation. In its gut contents were found filamentous blue-green algae, chlorophytes, diatoms and bark. This species grows to a length of 2.7 centimetres (1.1 in) SL.