Steatoda triangulosa
(Triangulate Cobweb Spider)

Picture ID 9016

Picture of Steatoda triangulosa (Triangulate Cobweb Spider) - Dorsal

Comments & ID Thoughts

Iā€™m going to guess this is a False Black Widow. Found in portland Oregon hiding in one of the wheels of a steel car tire dolly in our garage. My dad was removing the little wheels of the dolly to re-grease and repair them, and out she/he fell!

She was quite calm, not aggressive, and was quite happy when I opened the lid of the pill jar I kept her in to coax her out into a leaf.

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TangledWebItsyBitsyDavidGallegosSpider.webBugmanDan Recent comment authors
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BugmanDan
Member

Hi, and welcome to the site. Your little friend is a cobweb spider,Theridiidae family.
A female triangulate cobweb spider, Steatoda triangulosa species.
Generally considered a harmless house spider,they can be found in many protected places.
https://spiderid.com/spider/theridiidae/steatoda/triangulosa/
This is Cassi, she spent her life in my pantry eating pest bugs:
https://www.flickr.com/photos/32083154@N02/9811638304/in/dateposted/

ItsyBitsy
Moderator

Yes, this is Steatoda triangulosa…. Welcome to Spider ID. šŸ™‚

TangledWeb
Member

How did you differentiate her from Steatoda grossa?

ItsyBitsy
Moderator

Different abdominal pattern, stripes on the legs. S. grossa‘s pattern is a little simpler.

TangledWeb
Member

Thanks! I didn’t realize there was a difference in leg banding between the species.

DavidGallegos
Member

Hello!! Welcome to this board!

TangledWeb
Member

Hi! I’ve been here a while.

Additional Pictures

Picture of Steatoda triangulosa (Triangulate Cobweb Spider) - Dorsal Enlarge Picture
Picture of Steatoda triangulosa (Triangulate Cobweb Spider) - Dorsal Enlarge Picture
Picture of Steatoda triangulosa (Triangulate Cobweb Spider) - Dorsal Enlarge Picture