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Gastercantha cancriformis
Beautiful!
Belated Welcome to Project Noah , 3749100!
You already have 45 wonderful spottings!!
There is only Gasteracantha cancriformis found in US:
http://bugguide.net/node/view/1982/bgpag...
looks like some type of Gasteracantha
http://en.wikipedia.org/wiki/Gasteracant...