That is the Caligo memnon. I was wondering if there was a picture of this specific butterfly with its wings open as the Caligo illioneus could be an option with this additional information.
Antonio your spotting is a Caligo or Owl butterfly....
http://www.projectnoah.org/spottings/7087367/fullscreen
http://www.projectnoah.org/spottings/7087367/fullscreen Caligo sp Owl butterfy.
http://www.projectnoah.org/spottings/6047324/fullscreen Morpho
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