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Close up of a yellow sac spider - Spider control services with City Termite & Pest Control in Malvern, AR

Sac Spider

Actual Size: ¼ to ⅜”

Characteristics: Yellowish-brown in color with an elongated body

Legs: 8

Habitat:Lives outdoors in gardens and areas with decomposing matter, yet may enter households during fall to seek warmth. Constructs webs at the intersections of walls or where walls meet ceilings.

Habits:

  • Construct silk retreats or “sacs” where they rest during the day and retreat to for safety.
  • They are most active during the night-time hours.
  • Bites from sac spiders may cause mild irritation or discomfort.
  • Prefer to avoid confrontation and will typically retreat if disturbed.


Sac Spiders in The Central Arkansas

Commonly known as the “yellow sac spider”, these arachnids often exhibit a pale yellow-brown hue, sometimes tinged with hints of green. Similar to other spider species, sac spiders generally avoid human interaction and usually enter indoor spaces unintentionally. A frequent resident of homes, the sac spider is frequently mistaken for the brown recluse spider, despite lacking its characteristic “fiddle” pattern. Primarily, sac spiders sustain themselves by preying on various spider species and garden insects.

Sac Spider Habitat

Outdoors, sac spiders frequent gardens, hiding under vegetation, bark, within rolled leaves, and amid organic matter. Commonly transported in agricultural products such as grapes, sac spiders may inadvertently enter homes along with produce shipments. With the arrival of cooler temperatures in the fall, it’s typical to find these spiders seeking warmth indoors. Demonstrating their agility, sac spiders easily scale smooth surfaces and construct silk retreats resembling sacs at the junctions of walls or where walls meet ceilings.

Sac Spider Behaviors, Threats, or Dangers

Sac spiders are nocturnal predators that employ their silk sac primarily as a retreat or for enclosing their egg capsules. Active during the nighttime hours, they forage for insects under the cover of darkness. Often mistaken for brown recluse spider bites, injuries inflicted by common sac spiders follow a similar progression but are markedly far less severe. While the bite of a yellow sac spider may induce pain, it typically lacks medical significance except in cases of allergic reactions. Symptoms such as swelling, delayed healing, and ulcerated sores around the bite site can closely resemble those of other spider bites, leading to confusion. If you suspect a spider bite, it’s important to seek medical attention if symptoms persist or worsen.

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