Picture ID 169807

Picture of unidentified spider
  • Submitted by: 
  • Submitted: Nov 22, 2022
  • Photographed: Nov 22, 2022
  • Spider: Unidentified
  • Location: Fruita , Colorado, United States
  • Spotted Indoors: Garage or shed
  • Found in web?: Yes
  • Attributes:
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Steatoda grandis https://bugguide.net/node/view/889023 This is one of the less common Cobweb Spiders in North America. We only receive photos of it from a few states, Colorado, Utah, and Wyoming.


You are quite welcome. They look like Black Widows because they are in the same family, Theridiidae. The venom strength is vastly different though. I think the markings on this species are interesting too, they resemble a small plant’s opposite leaf or flower bud pattern. To predators the pattern may look like 6 large eyes in low light. The markings on some Steatoda spiders reflect light too…so 6 glowing big eyes to predators and a piece of a little plant to prey.
Spider markings are often significant for camouflage and useful for attracting or intimidating insects and other spiders.