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Close up of a yellow sac spider - Spider control services with General Pest Control in Middleburg Heights

Sac Spider

Actual Size: ¼ to ⅜”

Characteristics: Typically a pale yellow color, sometimes showing a hint of green. Some may have dark markings.

Legs: 8

Habitat: Lives outdoors in gardens and organic debris, but seeks indoor warmth in the fall. Spins webs in corners where walls and ceilings meet.

Habits:

  • Derives its name from building small nests that resemble tubes or sacs.
  • Possesses eight eyes arranged in two horizontal rows of four.
  • Despite being painful, their bite is typically harmless unless the person is allergic.
  • They are nocturnal hunters that actively seek out prey at night rather than relying on webs.


Sac Spiders in The Cleveland

Often called the “yellow sac spider,” these spiders are typically a pale yellow color, sometimes showing a hint of green. Like most spiders, sac spiders avoid human contact and usually enter homes accidentally. They are frequently found indoors and can be mistaken for the brown recluse due to their similar shape, but sac spiders lack the brown recluse’s distinctive “fiddle” pattern. Sac spiders primarily feed on various other spiders and garden insects.

Sac Spider Habitat

Sac spiders are commonly found outdoors in gardens, beneath vegetation, under bark, within rolled leaves, and amidst organic debris. These spiders are frequently transported in agricultural products like grapes and may enter homes on produce. During the fall, they are often spotted indoors as they seek warmth from the cooling outdoor temperatures. Sac spiders can effortlessly scale smooth surfaces and will build silk, sac-like retreats in corners where walls and ceilings intersect.

Sac Spider Behaviors, Threats, or Dangers

Sac spiders, though generally not aggressive, can pose certain threats and dangers. Their bites, can be quite painful and cause localized reactions such as redness, swelling, and itching. While most bites are not medically significant, there are cases where individuals may experience more severe symptoms, especially if they have an allergic reaction. In rare instances, necrotic lesions can develop at the bite site, requiring medical attention. Additionally, the presence of sac spiders indoors can be unsettling for residents, leading to anxiety. If you think a spider has bitten you, seek medical advice if the symptoms continue or worsen.

If you need help with sac spiders, contact your local spider exterminators.