Steatoda triangulosa
(Triangulate Cobweb Spider)

Picture ID 54745

Picture of Steatoda triangulosa (Triangulate Cobweb Spider) - Dorsal

Comments & ID Thoughts

Is this a spider we need to be concerned about being in our house? We have a baby and we are worried there could be more and they could bite our baby. Is this possibly a black widow? The pattern on its back was brown, not red, but still a pattern like a black widow.

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TangledWeb

Hi, this is Steatoda triangulosa, a Triangulate Cobweaver. The name comes from the row of attached triangle markings down the abdomen. Yes, it is in the same family, Theridiidae, as Black Widows. They have very different venom though. Black Widows have venom that causes cellular death in large animals. Other cobweaver spiders have venom that is very toxic to insects, spiders, and other arachnids, such as ticks. These are often called “false widows.” Some false widows can kill Black Widows. Cobweaver spiders make true cobwebs. The webs are wispy, messy, random-looking and tend to get dusty. The catch is that… Read more »

TangledWeb

You’re very welcome!

Additional Pictures

Picture of Steatoda triangulosa (Triangulate Cobweb Spider) - Female - Egg sacs Enlarge Picture
Picture of Steatoda triangulosa (Triangulate Cobweb Spider) - Dorsal Enlarge Picture
Picture of Steatoda triangulosa (Triangulate Cobweb Spider) - Female - Egg sacs,Webs Enlarge Picture
Picture of Steatoda triangulosa (Triangulate Cobweb Spider) - Dorsal Enlarge Picture