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I once caught very similar looking plecos in the Arroyo Sarandi, 50 km east of Uruguay. Thus it is possible they are from Uruguay, but dfue to the fact hardly any fishes are commercially shipoped from Uruguay not likely.
Still the Rio Uruguay devides Uruguay from Argentina, and from Argentina more fishes are shipped
From this Arroyo (Spanish for small river) a bleuish grey pleco @ ~40 was also found, I can not say the same speciers or not, butr we did not find any other plecos. Therefore you should keep in mind they might grow BIG