Potamotrygon orbignyi, the smooth back river stingray, is a species of river stingray in the family Potamotrygonidae. It is found in the Amazon and Orinoco River basins in South America.[1]
The genus name Potamotrygon comes from the Greek words potamos (river) and trygon (sting ray).The species name is in honor of Alcide Charles Victor Marie Dessalines d'Orbigny.