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" ... Potamotrygon is a genus of freshwater stingrays in the family Potamotrygonidae native to the rivers... [+] of South America. One of these is the bigtooth river stingray (Potamotrygon henlei) which is endemic to the Tocantins-Araguaia River Basin in Brazil. They, like the Xingu River stingray, are black with white/yellow spots. ... "