Author: (Engelhardt, 1912)
FBname: Red-blotched river stingray
Remark: This species may be synonymous with <i>Potamotrygon motoro</i> (Müller & Henle, 1841), and is tentatively accepted as valid on the basis of a single specimen from the Pedreira river that differs slightly in coloration, following Rosa (1985a). Reproductive biology unknown. Additional reference: Compagno & Cook (1995).