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Work cat.: (OSt)226841: Lacerda, A. C. F. 136339, Ecology of Endoparasites of the Fluvial Stingray Potamotrygon Falkneri - Chondrichthyes: Potamotrygonidae - From the Upper Paraná River Floodplain, Brazil / a. C. F. Lacerda; R. M. Takemoto; G. C. Pavanelli