Three species of widow spiders are native to Florida, and a fourth species has been introduced. No species of recluse spiders are native to Florida, but three species have been intercepted and occasionally have established populations in single buildings at scattered locations.
Both types of spiders tend to be found in similar places, which is in or under objects where their presence is not necessarily obvious. If you are lifting boards or firewood, reaching into storage boxes, or doing other activities that involve putting your hands into places you can't see, you should wear gloves to prevent being bitten by a hidden spider. Also, clothing — especially if unused for a considerable time — should be checked before wearing, as a spider may have taken up residence within it.
Widow Spiders
The widow spiders, genus Latrodectus (family Theridiidae), are worldwide in distribution. Females range from 8-15 millimeters in body length; males are smaller, sometimes very small (2 millimeters). Most have globose, shiny abdomens that are predominantly black with red markings (although some may be pale and/or have lateral stripes), with moderately long, slender legs.
These spiders are nocturnal and build a three-dimensional tangled web, often with a conical tent of dense silk in a corner where the spider hides during the day. In nature, most species are found under rocks and logs, but they readily adapt to human-altered environments, where they are most commonly found in outbuildings (sheds, barns, privies), water meter holes, nursery cans, and under any item or structure (e.g., barbeque grill, slide, sandbox) that has been undisturbed for a lengthy period.
Formerly, most bites by black widows (almost all by female spiders) occurred in outhouses, but presently Latrodectus bites occur most frequently when the spider is trapped against human skin, either when someone reaches under an object where the spider is hiding or when someone puts on clothing, gloves or shoes containing the spider. Widow spiders are generally very timid and only bite in self-defense when they accidentally contact humans.
Bite symptoms are systemic, spreading through the lymphatic system, and usually start about one to three hours after the bite. The most common symptoms are intense pain, rigid abdominal muscles, muscle cramping, malaise, local sweating, nausea, vomiting and hypertension. If left untreated, Latrodectus bite symptoms usually last three to five days. Calcium gluconate and/or antivenin may be administered to relieve or counteract symptoms.
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