Potamotrygon schroederi

There are two other P. schroederi variants that may not show the characteristic tail pattern and have dorsal patterns that are dissimilar to the Ventuari. An example, the so-called Sacha ray.....

http://www.elasmodiver.com/Potamotrygon%20schroederi%20Pictures.htm

http://www.amazonasrochen.ch/pictures/dezembernullsechs/mini-P1010033.JPG

http://www.amazonasrochen.ch/pictures/juninullsechs/mini-!cid_image018.jpg

http://www.goslinea.com/Gallerie/Rochen/Seiten/Potamotrygon%20schroederi%20var.htm