Potamotrygonidae

Great freshwater stingray

Potamotrygon rex

Yellow orange clusters shrink toward the disc edge

• Tropical
• Southern Hemisphere
• Regional distribution
• Freshwater fish
• South America
• Large
• Tropical fish

Potamotrygon rex, the great river stingray, is a species of freshwater stingray belonging to the family Potamotrygonidae, native to South America in the Neotropical region. P. rex, along with some other Potamotrygon species form a sub-species group known as "black stingrays" known by their similar features and their locality to rivers draining the Central Brazilian Shield. Specifically, it is native to the Rio Tocantins in the central Brazilian state of Tocantins.