Potamotrygon orbignyi

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.

Etymology
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.