Genus of cartilaginous fishes
Potamotrygon is a genus of freshwater stingrays in the family Potamotrygonidae native to the rivers of South America, and sometimes seen in the aquarium trade. It inhabits rivers of tropical and subtropical climates, especially those of the Amazon basin and is virtually present in all South American countries, except for Chile.
Like other stingrays, the fishes of this genus have venomous barbs at the base of their tails, and their stings are dangerous to humans. It is said that the natives of South America fear the stingray more than they do fear the piranha.
"Potamotrygon" vary considerably in color, pattern and size, with the maximum disc width ranging from in "P. wallacei" to in "P. brachyura".
In the aquarium.
Though freshwater stingray of other genera do appear in the trade, most are from "Potamotrygon". They are best kept with a deep, sandy substrate, in which they bury themselves, often with only the eyes visible. They are not territorial with other animals and can be kept in groups, provided a large enough aquarium is provided. They are carnivorous bottom feeders and require strong filtration as they are rather sensitive to water conditions. Many species of stingray have been bred in captivity and males can be determined by the presence of claspers as in other Chondrichthyans.
Species.
There are currently more than 30 recognized extant (living) species in this genus:
Extinct (fossil) species.
Three species are extinct and only known from Tertiary fossil remains:
References.
 ;templatestyles src="Reflist/styles.css" / ;