Steatoda
(False Widows)

Picture ID 99777

Picture of Steatoda (False Widows) - Lateral

Comments & ID Thoughts

I initially saw it in the dark and thought it was a black widow, but clearly isn't. It keeps to my bathroom window, catches little spiders and bugs, comes out at night, and goes back into the window corner during the day. The little guy has been around for about a month now, I'm not so concerned about it but curious what it is, any help would be greatly appreciated!

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TangledWebJkornfeld Recent comment authors
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TangledWeb
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Hi, it looks like a False Widow in genus Steatoda. We use the dorsal markings to tell the species apart by photo. A common one in California is Steatoda nobilis. They are in the same family as Black Widows and Brown Widows, but False Widows aren’t dangerous to people. As you noticed, they do kill other spiders along with insects. Their venom is potent in that way. At least one species of False Widow in your area, Steatoda grossa, can kill and eat Brown Widows. The Brown Widows can kill Black Widows. Spiders are quite fine with canabalism.

Additional Pictures

Picture of Steatoda spp. (False Widows) - Male - Dorsal Enlarge Picture
Picture of Steatoda spp. (False Widows) Enlarge Picture
Picture of Steatoda spp. (False Widows) - Ventral Enlarge Picture
Picture of Steatoda spp. (False Widows) - Dorsal Enlarge Picture