500 species of spiders have been found within the state of Wisconsin
according to Cofrin Center for Biodiversity at the University of
Wisconsin. Please scroll down this page to view some of the more
commonly found spiders in eastern Wisconsin, spider bite photos and
spiders move quickly in a jerky, irregular motion and
high, when considering their small size. There are about 300
species of jumping spiders found in the United States.
Spider (aka: Cellar
eight extremely long, thin legs and a small body. While sometimes
considered a nuisance, these spiders actually prey
upon brown recluse spiders,
this sense could be considered
spiders are often found in dark and damp places, such as basements and
cellars, and bathrooms.
spiders are more commonly found indoors and their webs are
often more of a nuisance than the spiders themselves.
There are over 100 wolf spider species in
the U.S. Very fast moving, these spiders don't hunt with spider
webs. They stalk their prey like a
wolf! Baby spiders live on the mother's back a
few weeks until
large enough to hunt on their own. [See below photo]
distinctive dark violin-shaped marking on top
of the front body
section. The neck of the violin points toward the rear.
Infestation levels in homes
vary greatly, ranging from one, a few, or hundreds.
of the brown recluse spider is
painless. However, localized burning sensation, then intense pain,
often develops within the first hour and during the next 6-12 hours, a small
pimple or white blister forms. The
surrounding tissue begins to
darken and take a raised appearance.
venom of this spider can cause extensive tissue damage
(necrotic reaction) and over the next 10-14 days, a sunken, open,
ulcerated sore up to several centimeters in diameter. It normally takes
6-8 weeks for a brown recluse spider bite to heal. A large sunken scar
may persist that requires surgery to repair. Not every brown recluse
bite results in ulcer formation. In rare cases systemic complications
such as liver or kidney damage result.
your physician or emergency room as soon as you suspect a brown recluse
spider bite. Capture the spider for later identification
(crush the specimen, if necessary, but do so as gently as possible).
Cannot bite through clothing because of its small fangs. Most people
are bitten on the hands or feet when handling infested items. [See
In homes, webs
are often produced by harmless cobweb or cellar
While sometimes considered a nuisance, these spiders actually prey
brown recluses, and in this sense could be considered
Web “sacs” are tubular in shape, about 1-inch long, typically
positioned between angled surfaces.
bite of a common sac spider can be misdiagnosed
as a brown recluse spider bite. Bite injuries develop in a similar
manner to that of a brown recluse spider, but
are much less severe, and can vary with various sac spider types.
Reactions, such as sharp pain felt upon the initial bite, swelling,
slow healing, and ulcerated sores around the bite site, are similar
enough to be confusing. Most bites will start to improve in a few hours
to 2-3 days.
& Fishing Spiders
The largest spiders in the Upper Midwest (1 inch long body);
typically found near water in the outdoors.
Produce tangled, crisscross webs; close relative of the Black
of a Northern Widow Spider is immediately painful.
The most reliable evidence of a bite is two tiny red puncture
around which the pain intensifies during the first three hours. The
pain continues for 12-48 hours and then gradually subsides. Venom
contains a neurotoxin that can cause headache, dizziness, shortness of
breath, and often painful abdominal spasms and back pain. Rigidity of
limbs, increased blood pressure, and profuse sweating are other
symptoms. Death seldom occurs in healthy adults though children and
adults in poor health may die within 12-32 hours from asphyxia.
Anyone suspecting a spider bite should receive medical
attention as soon as possible. A commercial antidote is available
for black widow spider bites. [See below bite photos]
first four legs are crab-like, extended out to the side; this spider
can walk backwards, forwards and sideways.
Egg Sac Close-up
information about these and other Wisconsin spiders can be found here.