Southern Black Widow
Latrodectus mactans
Theridiidae (Cobweb Spiders), Order Araneae
Physical Description
The specimen exhibits a rounded, bulbous abdomen typical of female cobweb spiders, paired with a smaller cephalothorax. The body appears dark, glossy, and smooth.
Size Estimate
Body length is approximately 10-15 mm with a leg span of roughly 30-40 mm, consistent with an adult female specimen.
Coloration & Markings
Dark black base coloration overall. While the distinctive red hourglass marking on the ventral side of the abdomen is obscured in this perspective, the glossy jet-black appearance is characteristic.
Web Type
Irregular tangle web (cobweb) constructed in dark, undisturbed low areas.
Eye Arrangement
Eight small eyes arranged in two distinct rows of four, typical of the family Theridiidae.
Leg Characteristics
Long, slender, smooth black legs with no prominent banding, often held close to the body in defensive postures.
Venom & Safety Information
Venom Information
Neurotoxic venom containing latrotoxin, which affects the nervous system and causes systemic symptoms.
Medical Significance
Medically significant. A bite can cause severe muscle cramps, abdominal pain, nausea, and sweating. Professional medical evaluation is recommended if bitten.
Safety Recommendations
Wear gloves when moving firewood or cleaning out dark corners. If found indoors, gently relocate using a container and a piece of card rather than handling directly.
Habitat & Behavior
Habitat & Range
Found across temperate and tropical regions worldwide, commonly inhabiting dark crevices, woodpiles, under stones, and sheltered corners around human structures.
Behavior & Temperament
Non-aggressive and reclusive; typically bites only when trapped, squeezed, or accidentally compressed against human skin.
Diet & Prey
Primarily feeds on crawling insects such as flies, beetles, ants, and grasshoppers caught in its irregular web.
Seasonal Activity
Most active during the warm spring and summer months, seeking sheltered overwintering sites as temperatures drop.
Description
A classic representative of the cobweb spider family, this dark-bodied arachnid is well known for its shy nature and potent neurotoxic venom. It prefers secluded microhabitats and rarely encounters humans unless accidentally disturbed.
Key Features
Glossy black, bulbous abdomen, slender legs, and preference for constructing messy, three-dimensional tangle webs near ground level.
Similar Species
False black widows (Steatoda grossa) and male black widows, which lack the potent venom and shiny black profile of adult females.
Life Cycle
Females produce multiple silken egg sacs containing hundreds of eggs. Spiderlings disperse via ballooning after hatching. Adult females may live up to several years.
Ecological Importance
Acts as an effective natural predator of various pest insects, helping to naturally regulate local insect populations.
Conservation Status
Not threatened; secure and widespread throughout its natural geographic distribution.
Interesting Facts
Females are infamous for occasional sexual cannibalism after mating, though this is less common in the wild than in laboratory settings.
Photography Tips
Use macro lenses with gentle, diffused side-lighting to highlight body contours and distinct markings without startling the specimen.
Identified: 2026-09-06T06:19:54.419505