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This is not a huge spider, but a first glance, I step back with fear. Those black marks in the abdomens, seemed to me a couple of eyes. Then I realized that it has 5 cm width. Even dough, it was a pair of intimidating jaws. This spider belongs to the order Araneae, family Sparassidae.
They are found in Argentina in arid areas and in the north. Build the nest in holes or in the ground. In this case, the hole is the spot to introduce a wheel for a valve in an abandoned oil producer well. It was pictured in Jujuy, near Caimancito town.