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Photo#118401
Pregnant spider - female

Pregnant spider - Female
San Francisco, San Francisco County, California, USA
November 26, 2006
Size: around 2cm body length

Not
so sure about previous comment. Where did you find it? Was it in a web, sac, or just wandering around?

 
Not an expert
but is Trachelas possible?

 
Found
Under a log in Glen Canyon, San Francisco, CA. No large web but some tangled mesh webbing against the log.

Hacklemesh weaver.
Decent image of a hacklemesh weaver in the family Amaurobiidae.

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