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Black spider - Steatoda bipunctata

Black spider - Steatoda bipunctata
Delta, British Columbia, Canada
November 29, 2008
Size: about 1/4 inch
I found this in the dead leaves blown into a corner of the patio, on cement. I have it in a jar, and it has made a sheet web there, and hangs upside-down under it.

It kind of looked like a juvenile black widow to me, although I don't know if we have any around here. I don't dare let it loose until I know.

Images of this individual: tag all
Black spider - Steatoda bipunctata Black spider - Steatoda bipunctata Black spider - Steatoda bipunctata Black spider - Steatoda bipunctata

Steatoda borealis?
What do you think of Steatoda borealis? I don't think it's a widow.

Yes, that looks right. The pa
Yes, that looks right. The pattern matches, the dimpling on the back matches, the web matches.

Thanks! That's a load off my mind.

Steatoda bipunctata
I asked Rod Crawford to look at your spider. He says, "Steatoda bipunctata (a rather recent introduction on the west coast)"

Thanks, Rod, and Lynette.
Thanks, Rod, and Lynette.

What are the defining marks of a bipunctata? As I read that, it means "two dots"; would that be the dimples on the upper back?

From Rod ~
By the way, the woman with the Steatoda bipunctata asks about
"identifying marks." There aren't any. I identified it from the
epigynum. But yes, it's probably named after the "dimples" (which
actually most spiders have - they're the apodemes or attachment points for the heart muscles).

Cool! Thanks again.
Cool! Thanks again.

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