Raspy river stingray

The raspy river stingray, mosaic stingray or arraia is a species of freshwater fish in the family Potamotrygonidae. This stingray is endemic to the Amazon basin in Brazil, where known from the Amazon–Pará River, the Madeira River basin, Uatumã River and lower Tocantins River.
It reaches up to in disc width and in total length. It is fairly common, but threatened by habitat loss. It is part of a group consisting of five allopatric Amazonian stingrays, the others being P. adamastor, P. amazona, P. garmani and P. limai. These all have three angular cartilages.