Long-tailed river stingray
The long-tailed river stingray or antenna ray is a species of freshwater stingray in the family Potamotrygonidae. It is found in the Amazon basin in South America, ranging from Ecuador to Belém. It lives in the main channel of the Amazon River and lower parts of its major tributaries.
Characteristic features are a very long filiform tail, reduced eyes, and a low number of pectoral-fin radials. It resembles the black-tailed antenna ray, but is larger at up to in disc width.
Their prey includes worms, crustaceans, mollusks, and small bottom fish. They can detect electrical and chemical signals from prey in mud and sand.
The species was described in 1987 by Hugo P. Castello from Museu de Zoologia, University of São Paulo. Previously misidentified, or unidentified, specimens were then found in other museums.
This fish occasionally appears in the aquarium trade and it has been bred in captivity, but the species is sensitive and the tail is easily damaged.
