Southern Black Widow, Hourglass Spider, Shoe-button Spider
Latrodectus mactans
Theridiidae (Cobweb Spiders), Order Araneae
Physical Description
Robust, bulbous abdomen with a glossy finish and a distinct cephalothorax. Females are significantly larger with a globular abdomen, while males are much smaller, slender, and feature lighter, banded patterns.
Size Estimate
Females typically have a body length of 8-13 mm and a leg span up to 38 mm; males are much smaller, around 3-6 mm.
Coloration & Markings
Jet black base coloration with a distinctive bright red or orange hourglass-shaped marking on the ventral (underside) surface of the abdomen.
Web Type
Irregular, sticky tangle web (cobweb) constructed in dark, undisturbed sheltered areas close to the ground.
Eye Arrangement
Eight eyes arranged in two rows of four, typical of the Theridiidae family, all relatively small and dark.
Leg Characteristics
Long, slender, smooth black legs without prominent spines, though the hind legs feature a comb of serrated bristles used to pull silk over prey.
Venom & Safety Information
Venom Information
Contains a potent neurotoxin called alpha-latrotoxin which affects the nervous system, causing severe muscle cramps and pain.
Medical Significance
Medically significant. Bites can cause severe pain, muscle rigidity, abdominal cramping, nausea, and sweating. Medical attention should be sought, though fatalities are extremely rare with modern treatment (antivenom).
Safety Recommendations
Wear gloves when clearing dark, undisturbed areas like woodpiles or under decks. Inspect shoes and outdoor gear before use. Relocate spiders safely using a container if found nearby.
Habitat & Behavior
Habitat & Range
Found across the southeastern United States and warm temperate regions worldwide. Prefers dark, dry, protected microhabitats such as woodpiles, under decks, stones, and outbuildings.
Behavior & Temperament
Nondressive and timid; prefers to flee or play dead when disturbed. Biting is strictly a defensive reaction when trapped against the skin.
Diet & Prey
Feeds primarily on crawling insects including flies, mosquitoes, grasshoppers, beetles, and other spiders caught in its sticky web.
Seasonal Activity
Most active during the warmer spring and summer months, seeking shelter indoors or in protected areas during winter.
Description
The Southern Black Widow is one of the most iconic and misunderstood spiders in North America. Known for its glossy black body and signature red hourglass, it resides quietly in hidden corners and dark recesses, serving as an effective natural pest controller.
Key Features
Jet black coloration paired with a bright red ventral hourglass mark, bulbous globular abdomen, and lack of aggressive posturing unless directly provoked.
Similar Species
False black widows (Steatoda grossa) lack the bright red hourglass marking and have a more matte, purplish-brown appearance.
Life Cycle
Females produce pear-shaped silk egg sacs containing hundreds of eggs. Spiderlings disperse via ballooning after hatching. Lifespan is up to 1-3 years for females.
Ecological Importance
Acts as an important predatory regulator of insect populations including agricultural and household pests.
Conservation Status
Not threatened; common and widespread throughout its natural geographic range.
Interesting Facts
Despite their fearsome reputation, black widows rarely bite unless accidentally compressed against human skin, and the female rarely consumes the male after mating despite popular belief.
Photography Tips
Use a macro lens with a diffuser flash to highlight the glossy texture and the vibrant red hourglass marking from a safe distance.
Identified: 2026-08-14T16:14:28.855327