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Potamotrygon brachyura

Potamotrygon brachyura
Giant Short Tail Stingray
The Short-tailed river stingray (Potamotrygon brachyura) is a species of river stingray (Potamotrygonidae) native to South America; they are known to inhabit Paraguay, Uruguay and Argentina basins. 
Short-tailed river stingrays are circular in shape and humped in the back. The biggest recorded specimen was a 661 pounds (300 kilograms) ray, which makes them the largest of the Potamotrygon species. They have a dark pattern on their backs, probably used as camouflage. The ray's tail is very muscular and thick, covered with short spines at the base and a venomous sting at the end.
They are mainly distributed throughout the Paraná-Paraguay River (including Cuiabá river in Brazil), Uruguay basins and Argentina.
Female stingrays give birth to up to 19 fully formed young stingrays at one time. The pups will start off eating plankton and then move on to consume small mollusks, crustaceans, the larvae of aquatic insects and fish.