Potamotrygon marinaePotamotrygon marinae is a type of freshwater tropical ray found exclusively in Suriname and French Guiana.DescriptionLittle is known of its biology. It is believed to reach a maximum size of disc width, with mature male specimens usually reach DW and mature female specimens reach DW in average.Habitat &; distributionThis stingray is endemic to the rivers of Guiana Shield in Suriname and French Guiana. Two direct major threats to this species are exploitation for international exotic fish market and habitat degradation resulted of nearby river mining activities.