What he said is that he didn't know that there were stingrays in the Parana river system.
He is familiar with the Amazon stingrays. The Parana in Argentina is much further south.
The species is Potamotrygon brachyura :
"the short-tailed river stingray, P. brachyura, which grows up to 1.5 metres (4.9 ft) in diameter. The upper surface is covered with denticles (sharp tooth-like scales). Most species are brownish or greyish and often have distinctive spotted or mottled patterns, but a few species are largely blackish with contrasting white spots."
He is familiar with the Amazon stingrays. The Parana in Argentina is much further south.
The species is Potamotrygon brachyura :
"the short-tailed river stingray, P. brachyura, which grows up to 1.5 metres (4.9 ft) in diameter. The upper surface is covered with denticles (sharp tooth-like scales). Most species are brownish or greyish and often have distinctive spotted or mottled patterns, but a few species are largely blackish with contrasting white spots."
