M. R. de Carvalho, M. H. S. Perez, and N. R. Lovejoy, “Potamotrygon tigrina, a new species of freshwater stingray from the upper Amazon basin, closely related to Potamotrygon schroederi Fernandez-Yépez, 1958 (Chondrichthyes: Potamotrygonidae)”, Zootaxa, vol. 2827, no. 1, pp. 1–30, Apr. 2011.