Potamotrygon leopoldi (Castex & Castello, 1970)
Common name: Polka-dot stingray, eclipse stingray
Range: Rio Xingu drainage, Brazil
Adult size: 250-400 mm DL
Description: Base color on the dorsal surface of the disc is black to very dark brownish gray. White spots can be round, lunate, or circular in shape. Underbelly often splotchy light gray. Several rows of spines on dorsal surface of the tail.
The photos below were borrowed with permission from Kings of the Aquarium.