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Triangulate Cobweb Spider (Steatoda triangulosa)


Detailing the physical features, habits, territorial reach and other identifying qualities of the Triangulate Cobweb Spider



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Image Credit: Arch Baker
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Image Credit: Rachel K. from KS
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Image Credit: Johanna F. from Ontario, Canada
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Image Credit: Raya A. from Stamford, CT
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Triangulate Cobweb Spiders are not afraid to take down an insect much larger than itself, letting their well-constructed webs do the hard work.



Updated: 07/15/2021; Authored By Staff Writer; Content ©www.InsectIdentification.org
The triangular pattern on the abdomen helped name this spider. It is a common house spider, hiding in dark corners of rooms or in out-buildings like sheds. They are believed to have poor eyesight, depending almost completely on feeling the vibrations from the web in order to find the prey entangled in it.

Triangulate Cobweb Spiders feed on a variety of insects including other spiders like the Brown Recluse. They are not known to be aggressive toward people and, possibly due to their tiny size, their venom is not life-threatening to people like that of the potential meals it eats. Like most Orb Weaver spiders, it rebuilds all or most of its web daily. A sturdy, well-built web in spider silk means the Triangulate Orb Weaver need only wait for a meal to wander into it. Once properly ensnared, the spider can feed on insects and arachnids much larger than itself with little fear of harm.




General Characteristics
Capability, Shape, Texture/Pattern, Benefits, Dangers
Insect biting icon
Venomous insect icon




Taxonomic Hierarchy
Species Breakdown
Kingdom: Animalia
  Phylum: Arthropoda
    Class: Arachnida
      Order: Araneae
        Family: Theridiidae
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          Genus: Steatoda
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            Species: triangulosa
Identifying Information
Size, Colors, Features
Scientific Name: Steatoda triangulosa
Other Name(s): Triangulate Bud Spider
Category: Spider
Size (Adult; Length): 3mm to 6mm (0.11" to 0.23")
Colorwheel Graphic Colors: brown; black
Descriptors: biting, venomous
Relative Size Comparison
Typical Size Between 3mm (0.1in) and 6mm (0.2in)
Lo: 3mm
Md: 4.5mm
Hi: 6mm
Territorial Map*
U.S., Canada, and Mexico
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Territory map graphic of the country of Mexico
Contiguous United States shape map layer graphic
Alaska  
Hawaii  
Prince Edward Is.  
* MAP NOTES: The territorial heat map above showcases (in red) the states and territories of North America where the Triangulate Cobweb Spider may be found (but is not limited to). This sort of data is useful when attempting to see concentrations of particular species across the continent as well as revealing possible migratory patterns over a species' given lifespan. Some insects are naturally confined by environment, weather, mating habits, food resources and the like while others see widespread expansion across most, or all, of North America. States/Territories shown above are a general indicator of areas inhabited by the Triangulate Cobweb Spider. Insects generally go where they please, typically driven by diet, environmental changes, and / or mating habits.

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