Potamotrygon tigrina, n. sp. Figures 1–6; Tables 1–2 Holotype. MUSM 39978 [ex. ANSP 182452], juvenile male, 495 mm TL, Río Nanay (Amazonas drainage), large beach (left bank) at village of Pampa Chica, 4.54 km west of Iquitos, Departamento Loreto, Peru, 03°45’09” S, 073°17’00” W, collected with a bag seine by M. Sabaj, C. Pérez, A. Bullard, O. Castillo & C. DoNascimiento, 8 March 2005. Specimen dissected dorsally and ventrally by A. Bullard to remove parasites (intestine, olfactory bulbs and gills fixed); caudal stings missing when captured (Figures 1–3, 5, 6). Paratype. ANSP 191998, preadult female, 560 mm TL, Río Nanay, Iquitos, Departamento Loreto, Peru (specimen donated to Nathan Lovejoy by Richard Ross; specimen somewhat dry, color faded) (Figures 4, 6). Diagnosis. A species of Potamotrygon diagnosed by its unique dorsal color pattern, composed of a light to dark brown or blackish background color, with a tan, bright yellow or orange irregular, highly curved and convoluted vermiculate pattern over ... : Published as part of De, Marcelo R., Sabaj, Mark H. & Lovejoy, Nathan R., 2011, Potamotrygon tigrina, a new species of freshwater stingray from the upper Amazon basin, closely related to Potamotrygon schroederi Fernandez-Yépez, 1958 (Chondrichthyes: Potamotrygonidae), pp. 1-30 in Zootaxa 2827 on pages 3-12, DOI: 10.5281/zenodo.319945 ...