Despite their abundance in the Amazon River, there is suprisingly little known about their general biology. In fact, there is still considerable confusion about their taxonomic status and phylogenetic realtionship to other stingray species. Interestingly, they are thought to have evolved from a common ancestor to modern Dasyatid stingrays, which have a well established ability to handle freshwater environments. Therefore, our studies on the relativley recently established freshwaterAtlantic stingraypopulations in the St. Johns River, FL may provide valuable insights into the early evolution of the Potamotrygonidae.
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