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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.
they share subclass elasmobranchii with sharks and chimaeras rays account for about half of all elasmobranch species of the 500 or more described ray species there are over 150 stingray species that are assigned to approximately 20 genera freshwater stingrays of the family potamotrygonidae are assigned to the genera paratrygon plesiotrygon heliotrygon and potamotrygon to date as many as 20 described species are assigned to potamotrygon p hystrix is recognized as the type species