Sac Spiders in Massachusetts
Of the over 45,000 known spider species in the world, most are harmless to humans. However, some spiders can inflict painful and medically significant bites. One such spider group is the sac spider family, which has approximately 1,400 species globally. Keep reading to learn key information about sac spiders found in Massachusetts and if they pose any danger.
What Are Sac Spiders?
Sac spiders belong to the family Cheiracanthiidae. They get their name from the silken sac-like retreats they construct for shelter. There are over 200 species of sac spiders in North America alone.
These spiders are medium-sized, typically ranging from 0.25 inches to 0.5 inches (5 to 10 mm) long. They have a rounded abdomen and eight eyes arranged in two horizontal rows on their cephalothorax (front body section). Sac spiders come in various colors like brown, black, yellow, and green.
Common Sac Spiders in Massachusetts
Some sac spiders commonly found in Massachusetts homes and buildings include:
- Black house spider (Parasteatoda tepidariorum)
- Barn funnel weaver (Tegenaria domestica)
- American house spider (Parasteatoda americana, was Achaearanea tepidariorum)
Signs of Sac Spiders
How can you tell if you have sac spiders? Here are some signs:
- Small, spherical silk retreats in corners or crevices
- Funnel-shaped webs near ground level
- Spiderlings clustering around females egg sac
- Seeing the spiders themselves running across floors
Do Sac Spiders Bite People?
Sac spiders do occasionally bite humans. However, most cases involve no venom being injected. When venom is released, it typically only causes a mild reaction.
Bites usually happen accidentally when a sac spider gets pressed up against the skin, like when putting on clothes. Bites can cause the following symptoms:
- Mild pain
- Itching or redness
- Slight swelling
The bite may feel like a pinprick or minor bee sting. Symptoms generally resolve on their own within a week or less.
Dangerous Spider Bites vs. Sac Spiders
Sac spider bites are generally harmless and much less serious than bites from potentially deadly spiders like black widows and brown recluses, which are also found in Massachusetts.
Black widows have neurotoxic venom that can cause muscle cramps, nausea, and respiratory issues in severe cases. Brown recluses have cytotoxic venom that destroys cell membranes and can cause necrotic ulcers.
Preventing Spider Bites and Infestations
To reduce your chances of getting bitten by a sac spider:
- Clear clutter like boxes from floors and corners
- Regularly vacuum and dust rooms
- Seal cracks around windows and doors
- Store items like clothes and linens in closed containers
- Inspect or shake out items before putting them on
Spider Control and Extermination
If you have an excessive spider issue at home, contact a licensed exterminator. They can assess if chemical spraying is needed for control and targeted elimination. Be sure to also fix any gaps, moisture, pests (flies and roaches) or clutter that may be attracting spiders inside.
First Aid for Spider Bites
If you get bitten by a spider in Massachusetts, you should:
- Wash the bite area with soap and water
- Apply a cold pack to relieve swelling and pain
- Monitor yourself carefully for signs of infection
- Contact your doctor if you experience severe symptoms
- Capture/kill the spider for identification if possible
Seeking prompt medical care is crucial for bites from spiders like black widows so antivenom treatment can be administered.
Preventing Skin Infections
Spider bites can occasionally develop bacterial infections. You can lower this risk by:
- Not squeezing or scratching bite sites
- Using topical antiseptics like alcohol, hydrogen peroxide, or iodine
- Keeping wounds covered with sterile bandages
- Taking oral antibiotics if prescribed
See your physician right away if you notice spreading redness, pus, swollen lymph nodes or flu-like illness as these may be signs of infection.
In Conclusion
Sac spiders are generally harmless to people. While their bites can sting and itch, symptoms usually resolve fairly quickly. Using preventative measures can help reduce bites and infestations inside homes and buildings in Massachusetts.
If you do suffer a significant spider bite reaction or have recurring issues, consult an exterminator and physician right away. With proper treatment and diligent pest control, sac spiders do not need to pose an ongoing nuisance or health hazard.
FAQs
What does a sac spider bite feel like?
A sac spider bite typically feels like a minor pinprick or bee sting. You may experience a bit of mild pain, itching, redness or slight swelling around the bite site. Symptoms generally clear up within a week without treatment.
How dangerous are sac spider bites?
Sac spider bites are generally not dangerous or medically significant. On rare occasions, bites can get infected or cause severe allergic reactions in sensitive individuals. Their venom is mild compared to more toxic spiders like black widows that also inhabit Massachusetts.
Where are sac spiders commonly found?
Sac spiders build silken retreats in undisturbed corners, crevices and gaps inside homes and buildings. Some species construct funnel-shaped webs near the ground. They favor cluttered areas with insects to feed on. Intruding sac spiders often enter from outside through cracks.
How can I keep sac spiders out of my home?
To deter sac spiders from your house, vacuum and clean rooms regularly, store items in sealed containers, remove clutter, fix gaps in the outside structure, install weather sealing, trim vegetation touching the exterior, and consider professional pest control spraying if infestations persist.
Disclaimer: This article is for informational purposes only and does not constitute medical advice. Always consult with a healthcare professional before starting any new treatment regimen.
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