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Hard to tell, but looks like a Steatoda triangulosa (aka "triangulate cobweb weaver").
Not sure why the link in my ID suggestion just says "none." Weird. I put this link there: http://www.araneae.unibe.ch/gallery/phot.... Cool spider, and nice shot!
Hi David, was this a captive specimen somewhere? Or was it found outdoors in nature? Just curious because this species isn't normally found in California. It's native to the Gulf States. Would be pretty interesting if it's become established in CA, too!
Looks like a female Neoscona crucifera instead. (Nephila clavipes looks different and is only found in the southeastern USA.)
Neoscona crucifera: http://bugguide.net/node/view/864597/bgi...
Nephila clavipes: http://bugguide.net/node/view/155378
From the underside view alone, I can't absolutely confirm it's Neoscona crucifera, but that is a common sighting this time of year, so could be.
(Olios fasciculatus turned out to be a Olios giganteus in North America.)