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Potamotrygon rex, a new species of Neotropical freshwater stingray (Chondrichthyes: Potamotrygonidae) from the middle and upper rio Tocantins, Brazil, closely allied to Potamotrygon henlei (Castelnau, 1855)

. Zootaxa. 4150, 5 (Aug. 2016), 537–565. DOI:https://doi.org/10.11646/zootaxa.4150.5.2.