(November 20, 2017) Freshwater stingrays are a fish family related to marine stingrays and sharks. The tectonic movements that led to the drift of the South American continent, at different times in its geological history, and the rise of the Andes, probably favored the penetration of some marine species, as is the case of the Potamotrygonidae family. The species of this family are widely distributed in the lowland rivers of the continent. The highest richness is found in the Amazon basin, with 22 out of 31 known s...

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