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.

[2] 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.

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