The Argentine snake-necked turtle, also known as the South American snake-necked turtle (Hydromedusa tectifera) is a species of turtle, known for the long neck which gave it its name. Despite appearances, the Argentine snake-necked turtle is probably more closely related to the Mata mata (Chelus fimbriatus) than to the Australian snake-necked turtles in the genus Chelodina. It is found in northern Argentina, Uruguay, Paraguay, and southern Brazil. Not much is known about them, as they have not been extensively researched. They are a popular pet in the exotic pet trade.