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Description of two extraordinary new species of freshwater stingrays of the genus Potamotrygon endemic to the rio Tapajós basin, Brazil (Chondrichthyes: Potamotrygonidae), with notes on other Tapajós stingrays

. Zootaxa. 4167, 1 (Sep. 2016), 1–63. DOI:https://doi.org/10.11646/zootaxa.4167.1.1.