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Hymenoptera, family Formicidae. This ant is of considerable size. Completely black, with reddish legs.
I took this picture inside the National Park Calillegua, Jujuy, in the border with the Caimancito Oil and Gas Field. I was crossing a stream of water and this ant was alone over a white stone. I can't realize how it gets there. Maybe swimming on the surface of the water.
this genre is broadly spread in Argentina. I couldn't identify the higher level of taxonomy from this picture.