Die Süßwasserstechrochen (Potamotrygonidae), oder einfach nur Süßwasserrochen genannt, sind eine in Südamerika lebende Familie der Rochen, sowie die einzige Familie der Knorpelfische, von denen die meisten Arten im Süßwasser vorkommen. Zu ihnen zählen fünf Gattungen mit über 30 Arten. Süßwasserstechrochen sind oft kreisrund, die Gattung Paratrygon etwas länger als breit. Sie haben keine Rückenflossen und keine Schwanzflosse. Der Schwanz ist peitschenförmig, mit einem giftigen, mit Widerhaken ver
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