Published on 18. February 2014 Potamotrygon limai, sp. nov., a new species of freshwater stingray from the upper Madeira River system, Amazon basin (Chondrichthyes: Potamotrygonidae) JOÃO PEDRO FONTENELLE, JOÃO PAULO C. B. DA SILVA & MARCELO R. DE CARVALHO ABSTRACT: Potamotrygon limai, sp. nov., is described from the Jamari River, upper Madeira River system (Amazon