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The stingrays are a large suborder of the rays. They are cartilaginous fishes related to sharks. They are classified in the suborder Myliobatoidei of the order Myliobatiformes, and consist of eight families. Most stingrays have one or more barbed stings on the tail, which is used only for self-defense. The sting may reach about 35 cm, and its underside has two grooves with venom glands.
Giant freshwater stingrays are listed as endangered by the International Union for the Conservation of Nature, in part due to Hogan's and Nantarika's work. âThese rays are decreasing rapidly since there is no national law to protect them,â Nantarika says.he giant freshwater stingray has the longest spine of any species of ray, up to 15 inches, and carries powerful venom. The animal uses its spine for defense and it can be lethal, but injuries to people are quite rare. Check out this archive video of Zeb Hogan examining another freshwater stingray.