Bigtooth river stingray

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Bigtooth river stingray
Potamotrygon national aquarium.jpg
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Chondrichthyes
Order: Myliobatiformes
Family: Potamotrygonidae
Genus: Potamotrygon
Species: P. henlei
Binomial name
Potamotrygon henlei
(Castelnau, 1855)

Trygon henlei Castelnau, 1855

The bigtooth river stingray or Tocantins River ray (Potamotrygon henlei) is a species of freshwater fish in the family Potamotrygonidae.[2] It is endemic to the lower Tocantins basin and Araguaia basin in Brazil,[3] and prefers muddy bottoms.[1] It is sometimes kept in aquaria.[1] This stingray is generally common and its population increased after the Tucuruí Dam was completed, unlike many other species in its range.[1]

P. henlei reaches up to 71 cm (2.33 ft) in disc width and 104.2 cm (3.42 ft) in total length.[1] 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.[3] 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.[4]


  1. ^ a b c d e 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. 
  2. ^ Froese, Rainer and Pauly, Daniel, eds. (2017). "Potamotrygon henlei" in FishBase. February 2017 version.
  3. ^ a b 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.
  4. ^ 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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