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66072 Plesiotrygon nana Carvalho & Ragno, 2011 Potamotrygonidae River stingrays Potamotrygoninae Myliobatiformes Elasmobranchii South America: Peru. Río Pachitea, tributary of Río Ucayali, up-river from town of Puerto Inca, Puerto Inca Province, Huánuco Department (Ref. 86912).