Brown Recluse, Violin Spider, Fiddleback Spider
Loxosceles reclusa
Sicariidae (Six-eyed Sicariid Spiders), Order Araneae. Characterized by having six eyes in three pairs and a flat carapace.
Physical Description
A medium-sized spider with a distinctively flattened cephalothorax and an oval-shaped abdomen. The body is covered in fine, velvety hairs but lacks thick spines or heavy bristles. The most diagnostic anatomical feature is the dark violin-shaped marking on the top of the head.
Size Estimate
Body length is typically 6-20 mm (1/4 to 3/4 inch). The leg span usually ranges from the size of a penny to a quarter. This specimen appears to be an adult.
Coloration & Markings
Uniformly tan to dark brown abdomen without patterns or stripes. The cephalothorax features a dark, dusky brown 'violin' or 'fiddle' marking, with the neck of the violin pointing toward the rear. Legs are solid-colored without banding.
Web Type
They build irregular, asymmetrical 'tangle' webs that appear wispy and off-white. Webs are used as retreats rather than for snaring prey and are typically hidden in dark, undisturbed corners.
Eye Arrangement
Uniquely, they possess six eyes arranged in three pairs (dyads) in a semi-circle: one median pair and two lateral pairs. Most spiders have eight eyes.
Leg Characteristics
The legs are long, slender, and uniformly colored (no bands). They are covered in fine hairs but lack the large, prominent spines found on many lookalike spiders (such as wolf spiders).
Venom & Safety Information
Venom Information
Contains a potent cytotoxic (tissue-destroying) protein called sphingomyelinase D. Most bites result in minor redness, but some can lead to necrotic skin lesions (dermonecrotic).
Medical Significance
Medically significant. While most bites heal without intervention, some cause necrotic ulcers. Severe systemic reactions (loxoscelism) are rare but serious. Treatment involves elevation and cleaning; see a doctor if a blister or black center develops.
Safety Recommendations
Avoid reaching into dark corners or boxes without looking. Shake out clothing and shoes left on the floor. Use sticky traps for monitoring. If bitten, catch the spider for ID and clean the wound with soap and water.
Habitat & Behavior
Habitat & Range
Found primarily in the Central and Southern United States. They prefer dark, dry, undisturbed locations such as basements, attics, woodpiles, cardboard boxes, and behind furniture.
Behavior & Temperament
Reclusive and non-aggressive. They are nocturnal hunters that prefer to flee rather than bite. Bites usually occur when a spider is accidentally pressed against skin (e.g., inside clothing or bedding).
Diet & Prey
Generalist predators feeding on various soft-bodied insects like silverfish, crickets, and cockroaches. They hunt actively at night after leaving their retreat.
Seasonal Activity
Active year-round in temperature-controlled indoor environments, but outdoor activity and mating peaks from spring through summer.
Description
The Brown Recluse is a modest-looking spider with a formidable reputation. Identified by its iconic violin marking and six eyes, it is a master of hiding in the shadows of human dwellings, where it provides silent pest control.
Key Features
Violin-shaped marking on cephalothorax, six eyes in three pairs, solid-colored legs without spines, and a velvety, uniformly colored abdomen.
Similar Species
Often confused with Southern House Spiders (Kukulcania hibernalis) which have longer pedipalps, and Wolf Spiders (Lycosidae) which have eight eyes and thick spines on more robust legs.
Life Cycle
Females produce 1-5 egg sacs containing roughly 50 eggs each. Spiderlings reach maturity in about a year. They are remarkably long-lived for small spiders, often living 2 to 4 years.
Ecological Importance
Plays a vital role as a household predator, significantly reducing populations of nuisance insects like cockroaches and silverfish.
Conservation Status
Not listed on IUCN Red List; they are common and widespread throughout their native range in the United States.
Interesting Facts
The Brown Recluse can go for several months without food or water. Despite their reputation, documented cases of skin necrosis are significantly higher than the actual number of confirmed recluse bites in many regions.
Photography Tips
A macro shot focusing on the top of the head (cephalothorax) to show the eye arrangement and violin marking is essential for positive identification.
Identified: 2026-06-15T13:49:59.855413