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Yellow Sac Spider (Chiracanthium inclusum)

Detailing the physical features, habits, territorial reach and other identifying qualities of the Yellow Sac Spider

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Yellow Sac Spiders have no qualms about biting people that threaten or disturb it regardless of human intention.

Updated: 04/30/2022; Authored By Staff Writer; Content ©www.InsectIdentification.org
This albino-looking spider is commonly found in homes, high up on walls, or crawling on ceilings. Yellow Sac Spiders may venture indoors during winter months in order to escape cold and frost. Their black feet make them easier to spot on light walls and ceilings. Their natural habitat is outdoors in grass, shrubs, and other vegetation. Research shows that their body colors slightly reflect the color of the insect most recently consumed. This is why differences in hue (rosy, green, etc) can be seen within the species.

The Yellow Sac Spider is slightly more aggressive than most house spiders and will bite, perhaps repeatedly, if threatened. Most contact with Yellow Sac Spiders is accidental. They tend to hide in piles of clothes (clean or dirty) and bite if they feel pressure when the clothes are picked up or put on. There is no consensus on how toxic the bite of this spider may be, although it is not known to be deadly. The initial bite can be painful to some people, but unnoticed by others. For some, a small red bump will form and eventually fade after a couple of weeks. In others, swelling, burning, and pain are experienced the first hour or so after the bite, then a pustule develops that naturally heals over a couple of weeks. If bitten, it is suggested that the spider is caught (not smashed) so it can be identified in case the bite develops into a serious skin infection. Contact your physician if it appears this spider's bite is growing worse.©InsectIdentification.org

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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: Miturgidae
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          Genus: Chiracanthium
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            Species: inclusum

Identifying Information

Size, Colors, Features
Scientific Name: Chiracanthium inclusum
Category: Spider
Size (Adult; Length): 5mm to 10mm (0.19" to 0.39")
Colorwheel Graphic Colors: white; yellow; black; green
Descriptors: biting; venomous; kitchen; bathroom

Relative Size Comparison

Typical Size Between 5mm (0.2in) and 10mm (0.4in)
Lo: 5mm
Md: 7.5mm
Hi: 10mm

Territorial Map*

U.S., Canada, and Mexico
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Prince Edward Is.  
* MAP NOTES: The territorial heat map above showcases (in red) the states and territories of North America where the Yellow Sac 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 Yellow Sac Spider. Insects generally go where they please, typically driven by diet, environmental changes, and / or mating habits.
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