I thought so too Dominik, but the guides seemed to have very patchy knowledge of arthropods, & even some of the amphibians. It does look like a match for M platypera - should I put Micandra sp. to be on the safe side?
Definitely a Hairstreak not a Morpho, much too small for Morpho.
Looks a little bit like Micandra sp., Micandra platyptera???
http://www.flickr.com/photos/andreaskay/6924256471/
http://butterfliesofamerica.com/micandra_platyptera_live1.htm
Angle is tricky and yours is also quite worn.
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