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65944 Heliotrygon gomesi Carvalho & Lovejoy, 2011 Potamotrygonidae River stingrays Potamotrygoninae Myliobatiformes Elasmobranchii Gomes's round ray South America: Brazil in the upper Rio Amazonas basin according to the material studied, but suspected to enter the lower reaches of most major tributaries and the lower Rio Amazonas basin as well.