Bigtooth river stingray
|Bigtooth river stingray|
Trygon henlei Castelnau, 1855
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.
- Rincon, G. (SSG South America Regional Workshop, June 2003) (2004). "Potamotrygon henlei". IUCN Red List of Threatened Species. Version 2008. International Union for Conservation of Nature. Retrieved November 16, 2009.
- Froese, Rainer and Pauly, Daniel, eds. (2017). "Potamotrygon henlei" in FishBase. February 2017 version.
- Carvalho, M.R.d. (2016): Potamotrygon rex, a new species of Neotropical freshwater stingray (Chondrichthyes: Potamotrygonidae) from the middle and upper rio Tocantins, Brazil, closely allied to Potamotrygon henlei (Castelnau, 1855). Zootaxa, 4150 (5): 537–565.
- Carvalho, M.R.d. (2016): Description of two extraordinary new species of freshwater stingrays of the genus Potamotrygon endemic to the rio Tapajós basin, Brazil (Chondrichthyes: Potamotrygonidae), with notes on other Tapajós stingrays. Zootaxa, 4167 (1): 1–63.
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