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By: Silva, João Paulo C.B. da - Carvalho, Marcelo R. deType: ArticleIn: Papéis Avulsos de Zoologia (São Paulo)Volume:Series:Issue:Date: 2011-01-01Page Range:Publication Info:Subjects: cryptic species Morphology Potamotrygon falkneri Potamotrygon tatianae sp. nov rio Madeira South America taxonomy