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
Globular, highly rounded shiny abdomen with a distinct cephalothorax, typical of female cobweb spiders. The silhouette reveals long, slender legs radiating outward from a compact central body mass.
Size Estimate
Body length of adult females typically ranges from 8 to 13 millimeters, with a leg span of up to 38 to 50 millimeters. This specimen appears to be an adult female based on the prominent, bulbous abdominal proportions.
Coloration & Markings
Jet-black glossy base coloration with a characteristic bright red or orange hourglass-shaped marking on the ventral (underside) surface of the abdomen.
Web Type
Irregular, three-dimensional tangle web or cobweb constructed near ground level in dark, sheltered areas, featuring strong sticky silk threads designed to catch crawling insects.
Eye Arrangement
Eight small eyes arranged in two horizontal rows of four, typical of the family Theridiidae, with the lateral eyes closely positioned or touching.
Leg Characteristics
Long, slender, smooth black legs without prominent spines, possessing comb-like rows of setae on the hind tarsi for manipulating silk.
Venom & Safety Information
Venom Information
Contains latrotoxin, a powerful neurotoxin that affects the nervous system, causing massive acetylcholine release at nerve terminals.
Medical Significance
Medically significant. A bite causes severe local pain followed by painful muscle cramps, abdominal rigidity, sweating, and nausea. Antivenom is available for severe cases, and medical attention should be sought immediately.
Safety Recommendations
Wear gloves when reaching into dark woodpiles or clearing undisturbed sheds. If found indoors, relocate the spider safely using a jar and stiff paper, or contact a professional if located in high-traffic living areas.
Habitat & Behavior
Habitat & Range
Found primarily in the southeastern United States and warm temperate regions worldwide, inhabiting undisturbed, dark, dry microhabitats such as woodpiles, rock crevices, underneath outdoor furniture, and outbuildings.
Behavior & Temperament
Non-aggressive and reclusive; retreats to a hidden corner of its web when disturbed. Bites typically only occur defensively when the spider is accidentally trapped, squeezed, or compressed against human skin.
Diet & Prey
Insects including flies, mosquitoes, beetles, grasshoppers, and other spiders captured when they stumble into the sticky snare of the web.
Seasonal Activity
Most active during the warm summer and autumn months when mating occurs. They overwinter as adults or large juveniles in sheltered protected retreats.
Description
The Southern Black Widow is one of the most recognizable and misunderstood spiders in North America. Featuring a glossy black body highlighted by a vibrant red hourglass, this reclusive orb weaver constructs messy tangle webs in quiet corners. Though notoriously venomous, they are docile animals that only bite in self-defense when pressed against the skin.
Key Features
Glossy black spherical abdomen, bright red ventral hourglass marking, lack of prominent patterning on the dorsal side, and association with a messy, three-dimensional tangle web.
Similar Species
False black widows (Steatoda grossa) lack the bright red hourglass marking and have a more oblong abdomen; male black widows and juveniles feature lighter red and white spotting.
Life Cycle
Females produce pear-shaped silk egg sacs containing hundreds of eggs. Spiderlings disperse via ballooning after hatching. Females can live for one to three years, often exhibiting sexual cannibalism after mating.
Ecological Importance
Acts as an effective biological control agent by consuming large quantities of pest insects, mosquitoes, and agricultural pests, maintaining local invertebrate population balances.
Conservation Status
Not evaluated by the IUCN, but populations are secure, widespread, and abundant throughout their natural range.
Interesting Facts
Female black widows are significantly larger than males and occasionally consume their mates after reproduction, giving the species its grim moniker. Their silk is among the strongest natural fibers known.
Photography Tips
Photograph from a safe distance using a macro lens and natural side lighting. Capture both the dorsal surface and gently coax the spider to reveal the ventral hourglass marking for positive identification.
Identified: 2026-09-06T05:55:16.356749