The taxonomy of the river stingrays is complex and undescribed species remain.
Potamotrygon schroederi (Rosette river stingray)
Potamotrygon constellata (Thorny river stingray)
Potamotrygon scobina (Raspy river stingray)
Sand is often recommended for use with certain species, such as the river stingrays of family Potamotrygonidae, which bury themselves in the fine substrate.
However, this interpretation is controversial, as parasitological evidence suggests that the river stingrays are most closely related to Pacific round rays in the genus Urobatis.
Short-tailed river stingrays are circular in shape and humped in the back.
The long-tailed river stingray or antenna ray, Plesiotrygon iwamae, is a species of freshwater stingray in the family Potamotrygonidae.
The river stingrays, and a number of whiptail stingrays (such as the Niger stingray), are restricted to fresh water.
The arraia or raspy river stingray (Potamotrygon scobina) is a species of fish in the Potamotrygonidae family.
