Xingu River ray | 水產百科網

TheXinguRiverray,white-blotchedriverstingray,orpolka-dotstingray(​Potamotrygonleopoldi)isaspeciesoffreshwaterfishinthefamilyPotamotrygonidae.

Species of cartilaginous fish

The Xingu River ray, white-blotched river stingray, or polka-dot stingray (Potamotrygon leopoldi) is a species of freshwater fish in the family Potamotrygonidae. It is endemic to the Xingu River basin in Brazil and prefers rocky bottoms.[1] It is sometimes kept in aquaria.[1] The Xingu river ray is a venomous stingray that contains venom localized at its dentine spine in its tail.[2] While the rays venom composition does not change with maturation, the venom toxicity decreases as rays get older.[2] On the other hand, rays’ jaw shape, stiffness, and mineralization are strengthened with age, which allows mature rays the ability to consume hard-shelled invertebrates.[3] These changes in traits with maturation reflect the different pressures rays experience in terms of functions such as feeding and avoiding predation during d...