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Thanks a lot @bayucca for the ID. Yes, it could be Argentata because it is very common on our gardens.
You have to verify Argentata for Argentina. Argiope sp. I think is fine, but the species you should check different ones, since yours is only the ventral side.
Me parece una arana magallanica,no estoy seguro.
Lat: -24.82, Long: -65.40
Spotted on Feb 27, 2012 Submitted on Jul 27, 2012