Brown Recluse, Violin Spider, Fiddleback Spider
Loxosceles reclusa
Sicariidae (Six-eyed Sand Spiders and Recluses), Order Araneae
Physical Description
The spider has a flat, pear-shaped cephalothorax and an oval, finely-haired abdomen. It lacks heavy spines on the legs and torso, possessing a smooth, almost velvety appearance due to microscopic hairs. This specific specimen is shown in a defensive or deceased curled posture.
Size Estimate
Body length is typically 6-12mm (1/4 to 1/2 inch) with a leg span of approximately 25-38mm (1 to 1.5 inches). This appears to be an adult specimen.
Coloration & Markings
Uniformly light tan to medium brown abdomen without spots or stripes. The cephalothorax features a distinctive dark brown violin-shaped marking on the dorsal side, with the 'neck' of the violin pointing toward the abdomen.
Web Type
Builds small, haphazard, off-white or grayish 'tangle' webs. These are not used for catching prey but serve as retreats in dark, secluded areas.
Eye Arrangement
A diagnostic feature of only six eyes arranged in three pairs (dyads) in a semi-circle across the front of the head, unlike most spiders which have eight eyes.
Leg Characteristics
The legs are long, thin, and slant-wise. They are uniformly colored without banding or contrasting rings. They lack the thick, coarse spines (macrosetae) found on many other common spiders.
Venom & Safety Information
Venom Information
Contains a potent cytotoxic (cell-destroying) enzyme called sphingomyelinase D. This can cause necrotic skin lesions in humans.
Medical Significance
Medically significant. While 90% of bites heal without complication, some can lead to necrotic ulcers or systemic reactions (loxoscelism). Seek medical attention if a bite is suspected.
Safety Recommendations
Shake out shoes and clothing left on the floor. Wear gloves when moving storage boxes or wood. To relocate, use a jar and stiff paper, keeping hands well away from the specimen.
Habitat & Behavior
Habitat & Range
Primarily found in the Central and Southeastern United States. They prefer dark, undisturbed microhabitats such as woodpiles, basements, closets, attics, and behind baseboards.
Behavior & Temperament
Reclusive and non-aggressive. They typically only bite when pressed against skin, such as when trapped in clothing or bedding. They are nocturnal hunters that roam for prey at night.
Diet & Prey
Generalist predators feeding on soft-bodied insects like crickets, silverfish, and cockroaches. They also readily scavenge recently dead insects, which is unique among many spiders.
Seasonal Activity
Active year-round indoors, but peak activity and encounters typically occur from spring through early autumn during mating and foraging periods.
Description
The Brown Recluse is one of the most misunderstood spiders in North America. It is a shy, plain-looking spider that avoids human contact but is notorious for its medically significant bite. It is best identified by its uniform leg color and characteristic violin marking.
Key Features
Violin-shaped marking on the cephalothorax, six eyes in three pairs, uniform brown color with no leg banding or abdomen patterns.
Similar Species
Cellar spiders (Pholcidae) have much longer, thinner legs; Southern House Spiders (Kukulcania hibernalis) are larger and lack the eye pattern; Wolf Spiders (Lycosidae) have distinct patterns and large eyes.
Life Cycle
Females produce 1-5 egg sacs containing roughly 50 eggs each. Spiderlings reach maturity in about a year and adults can live for 2 to 4 years, which is quite long for a small spider.
Ecological Importance
Acts as an effective natural pest control agent inside homes and outbuildings, preying on nuisances like cockroaches and silverfish.
Conservation Status
Not evaluated by IUCN; populations are stable and locally abundant within their native range.
Interesting Facts
Recluses can survive for months without food or water. They are also highly tolerant of many common household pesticides, making them difficult to eradicate once established.
Photography Tips
Focus on the 'head' area from a top-down angle to clearly document the eye arrangement and the violin marking for definitive identification.
Identified: 2026-05-04T23:03:35.461119