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Insect Identification

Yellow Sac Spider - (Chiracanthium inclusum)

Authored By Staff Writer | Last Updated: 3/15/2014

Yellow Sac Spiders have no qualms about biting people that threaten or disturb it, whether deliberately, or accidentally.

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This albino-looking spider is commonly found in homes, high up on walls or crawling on ceilings. Yellow Sac Spiders usually only venture indoors during winter months to escape the cold and frost. Their black feet make them easier to spot on light walls/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, greenish, etc) can be seen within the species.

This species is slightly more aggressive than most house spiders and will bite, perhaps repeatedly, if threatened. Most contact with yellow sac spiders is accidental for its part. They tend to hide in piles of clothes (clean or dirty) and bite if they feel pressure when the clothes are picked up and/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 if the bite develops into a serious skin infection. Contact your physician if it appears this spider's bite is growing worse.

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Category: Spider
Common name: Yellow Sac Spider
Scientific Name: Chiracanthium inclusum

Taxonomy:
  Kingdom: Animalia
   Phylum: Arthropoda
    Class: Arachnida
     Order: Araneae
      Family: Miturgidae
       Genus: Chiracanthium
        Species: inclusum

Adult Size (Length): 5mm to 10mm (0.20in to 0.39in) COMPARE

Identifying Colors: white; yellow; black; green

General Description: biting, venomous


North American Reach (Though Not Limited To*): Alabama; Alaska; Arizona; Arkansas; California; Colorado; Connecticut; Delaware; Florida; Georgia; Idaho; Illinois; Indiana; Iowa; Kansas; Kentucky; Louisiana; Maine; Maryland; Massachusetts; Michigan; Minnesota; Mississippi; Missouri; Montana; Nebraska; Nevada; New Hampshire; New Jersey; New Mexico; New York; North Carolina; North Dakota; Ohio; Oklahoma; Oregon; Pennsylvania; Rhode Island; South Carolina; South Dakota; Tennessee; Texas; Utah; Vermont; Virginia; Washington; West Virginia; Wisconsin; Wyoming; Alberta; British Columbia; Manitoba; New Brunswick; Newfoundland and Labrador; Nova Scotia; Ontario; Prince Edward Island; Quebec; Saskatchewan; Mexico


* Keep in mind that insect reach is not governed by lines on a map and therefore may appear in areas/regions/states beyond those listed above.


NOTE: Material presented throughout this website is for entertainment value and should not to be construed as usable for scientific research or medical advice (insect bites, etc...). Please consult licensed, degreed professionals for such information. Email corrections / Comments to InsectIdentification at Gmail dot com.
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