Steatoda triangulosa
(Triangulate Cobweb Spider)

Picture ID 5553

Picture of Steatoda triangulosa (Triangulate Cobweb Spider) - Dorsal

Comments & ID Thoughts

I apologize for the bad quality. The spider is about a quarter of an inch in length--perhaps slightly larger. It is dark brown/black in color with light brown markings along its abdomen, similar to that of a Redbacked Spider. It also has light-colored legs, with dark spots at the joints. I presume it is male, but I am not quite sure. When touched, it curled into a ball for a while.

I found it crawling up the wall of my stairwell to the basement while I was watching a video of a man opening Redbacked Spider egg sacs, ironically. I have been trying to identify the spiders in my home for the past 7 months, and this one struck me as new.

I am assuming it is a species of widow spider, but there are no images online that really depict its coloring and detail such as this one that I have found. Most have red or complex markings, but this one is just a brown coloration of the typical red markings, however remaining dark colored as a whole.

Please let me know if you need any more information or images (if possible). Thank you.

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ItsyBitsy

Hi, welcome to Spider ID. 🙂 Your spider is a Steatoda triangulosa (Triangulate Cobweb Spider). They’re nothing to worry about.

ItsyBitsy

You’re welcome, this species can vary a lot in color and how pronounced the pattern is.

Additional Pictures

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