White-blotched river stingrays are black with white spots across the top of their body and tail. Their enlarged pectoral fins make them look like floating discs. At maturity, they average about 16 inches across, but individuals can reach up to 30 inches. Their mouth and gills are located on their underside, allowing them to skim the river bottom for food. They primarily feed on small invertebrates, fish, snails and crabs.