Southern Black Widow, Black Widow Spider
Latrodectus mactans (likely candidate)
Family Theridiidae (Cobweb Spiders), Order Araneae. Characterized by a comb-like row of bristles on the tarsi of the fourth pair of legs.
Physical Description
The specimen shows a highly globose (rounded/spherical) abdomen and a significantly smaller cephalothorax. The body is glossy and dark, typical of the genus Latrodectus. The legs are slender relative to the bulbous body.
Size Estimate
Estimated body length of 8-10mm for an adult female; with legs, the span likely reaches 25-35mm. The specimen in the container appears to be a sub-adult or adult female.
Coloration & Markings
Deep jet-black glossy body. While the ventral (underside) is not clearly visible in this angle, this species is noted for a red hourglass marking. Some specimens may show red spots on the dorsal side if immature.
Web Type
Tangle web or cobweb. These are irregular, three-dimensional structures of very strong, sticky silk, often built in dark, recessed corners close to the ground.
Eye Arrangement
Eight eyes in two rows of four. The eyes are small and typically not the primary identification feature without high magnification, as they rely more on vibrations in the web.
Leg Characteristics
Long, slender legs. The first pair is the longest. Legs are dark black and lack the heavy spination or banding found in many other families; they look smooth and tapered.
Venom & Safety Information
Venom Information
Contains alpha-latrotoxin, a potent neurotoxin. It affects the nervous system by causing a massive release of neurotransmitters, leading to muscle pain and spasms.
Medical Significance
Medically significant. While rarely fatal to healthy adults, the bite (latrodectism) causes severe pain, muscle cramps, and abdominal rigidity. Seek medical attention if bitten, especially for children or the elderly.
Safety Recommendations
Use gloves when moving woodpiles or cleaning dark corners. If found indoors, carefully relocate using a jar and stiff paper. Do not handle with bare hands. If bitten, apply ice and go to an emergency room.
Habitat & Behavior
Habitat & Range
Found throughout the Southeastern United States. Preferred habitats include woodpiles, garages, basements, crawlspaces, and hollow stumps. They prefer dark, undisturbed locations.
Behavior & Temperament
Highly sedentary and non-aggressive. They typically stay in their webs and will only bite if pressed against skin or if their web is directly threatened. They often play dead (thanatosis) when disturbed.
Diet & Prey
Primarily insects such as beetles, cockroaches, and flies. They use their strong silk to wrap large prey, then inject venom to liquefy the internal tissues for consumption.
Seasonal Activity
Most active in late summer and autumn when females reach full size and mate. In warmer climates, they may be active year-round indoors.
Description
An iconic and often feared resident of the American South, the Black Widow is defined by its architectural tangle webs and its striking, patent-leather-black appearance. It is a shy, nocturnal hunter that provides excellent pest control.
Key Features
Large spherical abdomen, glossy black texture, slender legs, and the presence of a red ventral hourglass (though hidden in this view).
Similar Species
Steatoda grossa (False Black Widow) lacks the red marking and is usually brownish; Latrodectus variolus (Northern Black Widow) has a broken hourglass marking.
Life Cycle
Females produce papery, tan egg sacs containing hundreds of eggs. Spiderlings disperse via ballooning. Females can live up to 3 years; males are much smaller and short-lived.
Ecological Importance
Significant apex predator among invertebrates. They control populations of agricultural pests and household nuisances like cockroaches and crickets.
Conservation Status
Not evaluated by IUCN; generally considered common and widespread with stable populations throughout its range.
Interesting Facts
The 'widow' name comes from the rare but documented behavior of the female consuming the male after mating, though this is less common in nature than in lab settings.
Photography Tips
A lateral (side) view and a ventral (belly) view are critical to confirm the hourglass marking. Use a macro lens and avoid using a direct flash that causes 'hot spots' on the spider's glossy surface.
Identified: 2026-07-20T01:34:47.709259