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House Spider and Nephila clavipes

Posted by June 9th, 2004 at 12:00 am

Categories

Spiders

Hi.
Spiders, in general, freak me out. Your page makes me squirm and squint. I could use some help identifying a spider I found in abundance in my garage. The brown spider was with a dozen of his buddies… and dozens of eggs. They took over some shelves we had in our garage. I’m an over-protective new parent. Should this spider concern me? I also attached a spider that almost made my hair turn white. My wife and I came across it hiking in BVI. Is that thing poisonous?
Thanks
Scott

Hi Scott,
The brown spider in your home is Theridion tepidariorum, the most common of all house spiders. They spin a tangled maze of threads in the corners of neglected rooms. They are sedentary, spint webs to catch prey and to place their egg sacs. Off all the spiders that inhabit our dwellings, this is the most familiar, so it is sometimes called the Domestic Spider. It is exceeedingly variable in color and markings. The female is larger. They are harmless.
The frightening spider from BVI (where is that?) is a silk spider called Nephila clavipes. They build enormous strong webs. They occur in the tropics and the American South. Your photo is the female which is about 100 times the size of the diminutive male. They may bite, but are relatively harmless. They are sometimes called Banana Spiders, but that is a common name used on Giant Crab Spiders as well.

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