Kingdom Animalia Order Myliobatiformes Genus Potamotrygon Higher classification Potamotrygon | Phylum Chordata Family Potamotrygonidae Scientific name Potamotrygon henlei Rank Species | |
 | ||
Similar Potamotrygon, Batoids, Xingu River ray, Stingray, Potamotrygonidae | ||
The bigtooth river stingray or Tocantins River ray (Potamotrygon henlei) is a species of freshwater fish in the family Potamotrygonidae. It is endemic to the lower Tocantins basin and Araguaia basin in Brazil, and prefers muddy bottoms. It is sometimes kept in aquaria. This stingray is generally common and its population increased after the Tucuruí Dam was completed, unlike many other species in its range.
P. henlei reaches up to 71 cm (2.33 ft) in disc width and 104.2 cm (3.42 ft) in total length. It is replaced by the closely related P. rex in the mid and upper Tocantins basin, but that species has concentrically clustered yellow-orange spots. Two other close relatives where the spots are yellowish-white (as in P. henlei) are found in other Brazilian rivers: P. leopoldi from the Xingu River basin and P. albimaculata from the Tapajós River basin.