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Latrodectus geometricus
The last 4 pictures of the series were captured the night after shooting the first 2 pictures, only 50 cm away. I suppose they are the same specie or even more, the same individual (because I found the exoskeleton of the spider in the web, which can be a sign that it molted). I think they are Latrodectus, but I can not find the specie.
Dry forest
After long discussion with some colleagues, the spider was identified as Latrodectus geometricus.
Thanks John, I checked all the known Latrodectus for South America, and none of the species listed is similar to that one (Except probably for L. antheratus). I will need to take more pictures of the spider.
Certainly a Latrodectus (some form of black widow).
I am not sure that L. mactans extends as far south as Ecuador, so it might be a different species.
http://en.wikipedia.org/wiki/Latrodectus...