Southern Black Widow, Hourglass Spider, Shoe-Button Spider
Latrodectus mactans
Theridiidae (Cobweb Spiders), Order Araneae. Key family characteristics include a rounded abdomen, comb-like setae on the fourth tarsus used for flinging silk over prey, and irregular tangle webs.
Physical Description
The spider has a glossy, bulbous, rounded abdomen and a smaller cephalothorax. The body texture is smooth and shiny, appearing almost polished. This specimen is likely an adult female due to the robust, rounded body shape and characteristic bright markings contrasting against the deep black coloration.
Size Estimate
Body length is approximately 8 to 13 millimeters for females, with a leg span of about 25 to 38 millimeters. This is typical for a mature female Southern Black Widow.
Coloration & Markings
Deep, jet-black base coloration with a high-gloss finish. On the dorsal or ventral side of the abdomen, there is a distinct reddish-orange or yellowish marking that often resembles an hourglass shape, characteristic of the species.
Web Type
Builds a three-dimensional, irregular tangle web (cobweb) close to the ground in dark, undisturbed areas. The web features a sticky, funnel-like retreat where the spider hides.
Eye Arrangement
Eight small eyes arranged in two rows of four, typical of the Theridiidae family, with lateral eyes often touching or closely juxtaposed.
Leg Characteristics
Long, slender, glossy black legs with no prominent banding. The hind legs feature a distinct comb of serrated bristles used to wrap prey in silk.
Venom & Safety Information
Venom Information
Contains latrotoxin, a powerful neurotoxin that affects the nervous system. The venom is potent, but because spiders inject small quantities, fatalities are exceedingly rare with modern medical care.
Medical Significance
Medically significant. A bite causes immediate local pain, followed by severe muscle cramps, abdominal rigidity, sweating, nausea, and tremors. Medical attention should be sought immediately if bitten, though antivenom and supportive treatments are highly effective.
Safety Recommendations
Wear gloves when moving firewood or cleaning out dark, undisturbed storage areas. If found indoors, safely relocate the spider using a container and a piece of card, or contact pest control if the location poses a high risk to children or pets.
Habitat & Behavior
Habitat & Range
Found across the southern and eastern United States, ranging from New York to Florida and west to Texas and Oklahoma. Prefers dark, dry, sheltered microhabitats such as woodpiles, stone walls, under undisturbed debris, outbuildings, and crawl spaces.
Behavior & Temperament
Generally non-aggressive and retiring; bites usually occur only in self-defense when accidentally pressed against human skin, trapped, or when protecting an egg sac. Primarily nocturnal.
Diet & Prey
Feeds primarily on insects such as flies, mosquitoes, grasshoppers, beetles, and caterpillars, as well as other spiders. Prey stumbling into the web is quickly immobilized by silk and venom.
Seasonal Activity
Most active during the warm spring and summer months. Mating typically occurs in spring, and females overwinter in sheltered retreats.
Description
The Southern Black Widow is one of North America's most recognizable and misunderstood spiders. Featuring a glossy black body highlighted by a vibrant red hourglass, this elusive cobweb architect prefers quiet, undisturbed corners of nature and human structures alike. While equipped with a potent neurotoxin, they are peaceful neighbors that prefer flight over fight, serving a vital role in natural insect regulation.
Key Features
Glossy jet-black body, bulbous abdomen, and a distinctive red or orange hourglass-shaped marking on the underside.
Similar Species
False black widows (Steatoda grossa) which lack the red hourglass and have a more purplish-brown, oblong body; and male or juvenile black widows which may have red or white spots on the back rather than a solid hourglass.
Life Cycle
Females construct paper-like silk egg sacs containing hundreds of eggs. Spiderlings disperse via ballooning soon after hatching. Females can live up to three years, while males have much shorter lifespans and often fall victim to sexual cannibalism.
Ecological Importance
Acts as an effective apex predator for small invertebrates in its microhabitat, helping control populations of pest insects like flies and mosquitoes.
Conservation Status
Not evaluated by the IUCN, but populations are secure, widespread, and common throughout their native range.
Interesting Facts
Despite their fearsome reputation, black widows rarely bite unless directly squeezed or sat upon. The silk of the black widow is remarkably strong and was historically used as crosshairs in optical sighting instruments.
Photography Tips
Use a macro lens from a safe distance without disturbing the spider. Ring flashes or side lighting help capture the glossy texture of the exoskeleton and the bright color of the hourglass marking.
Identified: 2026-09-15T12:28:04.557633