Brown Recluse, Violin Spider, Fiddleback Spider
Loxosceles reclusa
Sicariidae (Recluse Spiders), Order Araneae
Physical Description
A medium-sized spider with a distinct flat cephalothorax and an oval-shaped abdomen. The body is relatively smooth with very fine, short hairs rather than long bristles. Its legs are long and slender without prominent spines.
Size Estimate
Body length typically 6-20 mm (1/4 to 3/4 inch); leg span approximately the size of a U.S. quarter to a half-dollar. This specimen appears to be an adult.
Coloration & Markings
Light to medium brown coloration. Most notably, features a dark, violin-shaped (fiddle) marking on the cephalothorax, with the neck of the violin pointing toward the abdomen. The abdomen is uniform in color (tan to dark brown) without patterns or spots.
Web Type
Builds irregular, loose, sticky, off-white or grayish webbing in undisturbed dark areas. These are not used for prey capture but rather as a retreat/retreat base.
Eye Arrangement
Highly diagnostic: six eyes arranged in three pairs (dyads) in a semi-circle across the front of the cephalothorax. Most spiders have eight eyes.
Leg Characteristics
Long, thin, and uniformly colored legs. They lack thick spines but are covered in fine hairs. When at rest, the spider often holds its legs in a somewhat flattened, splayed posture.
Venom & Safety Information
Venom Information
Possesses a potent cytotoxic (tissue-destroying) venom containing the enzyme sphingomyelinase D. This can cause necrosis (skin death) in the area surrounding the bite.
Medical Significance
Medically significant. While most bites result in minor redness, some develop into a necrotic ulcer. Systemic reactions (loxoscelism) are rare but serious. 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 the cup-and-paper method carefully. Use sticky traps for monitoring infestations.
Habitat & Behavior
Habitat & Range
Primarily found in the Central and Southeastern United States. They prefer dark, dry, undisturbed locations such as basements, attics, woodpiles, closets, and behind furniture.
Behavior & Temperament
A shy, nocturnal, and non-aggressive hunter. It actively wanders at night to find prey. It is prone to biting only when trapped against skin (e.g., inside clothing or bedding).
Diet & Prey
Feeds on a variety of soft-bodied insects like silverfish, crickets, and cockroaches. They are active hunters that do not rely on webs to catch prey.
Seasonal Activity
Active year-round in temperature-controlled homes, with peak outdoor activity and wandering from spring through autumn.
Description
The Brown Recluse is one of the few spiders in North America with medically significant venom. Characterized by its shy nature and distinctive violin marking, it is often misunderstood. It plays a role in controlling indoor pest populations but requires caution due to its necrotic venom.
Key Features
Six eyes in three pairs; dark violin-shaped mark on cephalothorax; uniformly colored abdomen without spots; long, spineless legs.
Similar Species
Often confused with Wolf Spiders (Lycosidae), Cellar Spiders (Pholcidae), or Southern House Spiders (Kukulcania hibernalis). These others have eight eyes and visible leg spines/patterns.
Life Cycle
Females produce one to five egg sacs per year. Spiderlings molting several times over a year to reach maturity. Adults typically live 1 to 2 years, though they are remarkably resilient and can survive long periods without food.
Ecological Importance
Acts as a natural pest controller, preying on many common household insects that are considered pests.
Conservation Status
Not listed; populations are generally stable and common within their established geographic range.
Interesting Facts
The Brown Recluse can go months without food or water. Despite their reputation, many people live in infested homes for years without ever being bitten due to the spider's reclusive nature.
Photography Tips
A clear top-down photo of the cephalothorax is essential to see the violin mark and the eye arrangement (the 'three-pair' pattern).
Identified: 2026-05-11T16:18:30.762241