Brown Recluse, Fiddleback Spider, Violin Spider
Loxosceles reclusa
Sicariidae (Six-eyed Sand Spiders and Recluses), Order Araneae
Physical Description
A medium-sized spider with a relatively flat cephalothorax and an oval-shaped abdomen. The body is covered in fine, short hairs giving it a matte, velvety texture. It lacks any thick spines on the legs or body.
Size Estimate
The body length is typically 6-20 mm (1/4 to 3/4 inch), with a total leg span roughly the size of a U.S. quarter to a half-dollar (about 25-50 mm).
Coloration & Markings
Characterized by a solid-colored light brown or tan abdomen with no stripes or spots. The most famous feature is the dark brown 'violin' or 'fiddle' marking on the dorsal side of the cephalothorax, with the neck of the fiddle pointing toward the abdomen.
Web Type
Builds irregular, asymmetrical 'tangle' webs that appear wispy and off-white. These webs are used for retreats rather than primary prey capture and are typically hidden in dark, undisturbed corners.
Eye Arrangement
Distinctive arrangement of six eyes organized into three pairs (dyads) in a semi-circle. This is a primary diagnostic feature separating it from most common house spiders which have eight eyes.
Leg Characteristics
The legs are long, slender, and monochromatic (not banded). They are covered in very fine hairs but lack the large, prominent spines found on most other spider families.
Venom & Safety Information
Venom Information
Possesses a necrotic (cytotoxic) venom containing the enzyme sphingomyelinase D, which can cause tissue destruction and, in rare cases, systemic reactions (loxoscelism).
Medical Significance
Medically significant. Most bites result in minor redness, but some may develop into a necrotic ulcer that takes weeks to heal. Systemic reactions are rare but require immediate medical attention. Treatment involves wound care and monitoring.
Safety Recommendations
Shake out shoes and clothing stored in dark areas before use. Seal cracks around baseboards and use sticky traps in corners to monitor and reduce populations. If bitten, seek medical advice and try to collect the specimen for identification.
Habitat & Behavior
Habitat & Range
Common in the South-Central and Midwestern United States. They prefer dark, dry, undisturbed microhabitats such as woodpiles, sheds, basements, closets, and behind furniture or inside cardboard boxes.
Behavior & Temperament
Reclusive and non-aggressive. They are nocturnal hunters that roam for prey at night. They typically only bite when pressed against human skin, such as when trapped in clothing, bedding, or shoes.
Diet & Prey
Generalist predator feeding on soft-bodied insects like crickets, cockroaches, and silverfish. They are known to scavenge on recently dead insects, which is unusual for most spiders.
Seasonal Activity
Active year-round indoors, but sightings peak during the spring and summer months during forays for mates or food.
Description
The Brown Recluse is a misunderstood inhabitant of the American Midwest and South. Shunning the spotlight, this velvety brown spider is a master of concealment, preferring the quiet darkness of a cardboard box or a dusty crawlspace. While its necrotic venom is legendary, the spider itself is shy and would rather flee than fight, only biting as a last resort when its personal space is compromised by a human reaching for an old shoe or blanket.
Key Features
Violin-shaped marking on the cephalothorax, six eyes in three pairs, solid-colored abdomen without markings, and legs without spines.
Similar Species
Often confused with Tegenaria (Hobo spiders), Philodromidae (Running crab spiders), and Kukulcania (Southern House Spiders). Kukulcania is frequently mistaken for a recluse but has eight eyes and a different body texture.
Life Cycle
Females produce one to five egg sacs containing about 50 eggs each. Spiderlings reach maturity in about a year and are remarkably long-lived for small spiders, often living 2 to 4 years.
Ecological Importance
Serves as an effective natural pest control agent within indoor and perimeter environments, preying on invasive or nuisance insects like cockroaches.
Conservation Status
Not evaluated by IUCN, but populations are stable and locally abundant in their native range.
Interesting Facts
The Brown Recluse can survive for several months without food or water. Despite their reputation, many homes in endemic areas harbor thousands of these spiders without the residents ever sustaining a bite.
Photography Tips
Focus on the 'head' region (cephalothorax) to clearly capture the violin marking and the eye arrangement. Side or top-down views are best.
Identified: 2026-06-01T00:26:24.413021