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Micrathena pungens
small orbweaver with 2 black horns
amazon
I was only able to get this shot of the spider. Hope it's enough for ID. Tupana Aru reserve.
Definitely a Micrathena sp. and most probably Micrathena pungens.
http://www.arachnoboards.com/ab/showthre...
http://www.flickr.com/photos/artour_a/24...
http://www.flickr.com/photos/rainforests...