Brown Recluse, Fiddleback Spider, Violin Spider
Loxosceles reclusa
Sicariidae (Recluse Spiders), Order Araneae
Physical Description
A medium-sized spider with a distinct flat, pear-shaped cephalothorax and an oval-shaped, velvety abdomen. It lacks conspicuous spines on the legs and has a signature dark violin-shaped marking on its head area.
Size Estimate
Body length typically ranges from 6 to 20 mm (1/4 to 3/4 inch), with a leg span approximately the size of a U.S. quarter to a half-dollar.
Coloration & Markings
Uniformly light to medium brown or tan; the abdomen is typically darker or grayish. The most diagnostic feature is the dark brown 'violin' or 'fiddle' pattern on the dorsal cephalothorax.
Web Type
Not an orb-weaver. It builds irregular, haphazard, off-white or grayish sticky webs, usually in dark, undisturbed corners or crevices for retreats rather than prey capture.
Eye Arrangement
Unique arrangement of 6 eyes (three pairs or 'dyads') in a semicircle/U-shape, unlike the typical 8 eyes found in most spider families.
Leg Characteristics
Long, slender legs with a smooth appearance, lacking thick spines but covered in fine hairs. They are held in a somewhat flattened posture at rest.
Venom & Safety Information
Venom Information
Contains sphingomyelinase D, a necrotic toxin that can cause tissue breakdown (dermonecrosis). Most bites result in minor localized irritation, but a small percentage lead to necrotic lesions.
Medical Significance
Medically significant but rarely fatal. A bite may cause a 'bullseye' lesion, localized pain, and in rare cases, systemic symptoms (loxoscelism). Consult a doctor if a necrotic sore develops.
Safety Recommendations
Shake out shoes and clothing stored in dark areas. Wear gloves when moving woodpiles. If bitten, clean the area, apply ice, and seek medical attention if a sore appears.
Habitat & Behavior
Habitat & Range
Primarily found in the Central and Southeastern United States. Prefers dark, dry, sheltered environments such as basements, attics, woodpiles, and behind furniture.
Behavior & Temperament
Shy, reclusive, and non-aggressive. It typically retreats when disturbed and only bites in self-defense, usually when trapped against skin in clothing or bedding.
Diet & Prey
An opportunistic hunter that feeds on soft-bodied insects like crickets, silverfish, and cockroaches. It may also scavenge on dead insects.
Seasonal Activity
Active year-round indoors, but most sightings occur between March and October when they search for mates or new territory.
Description
The Brown Recluse is a notorious but misunderstood inhabitant of the American Midwest and South. Recognizable by its sandy brown color and three pairs of eyes, it spends its life in the shadows acting as an effective predator of household pests.
Key Features
Dark violin-shaped mark on cephalothorax; six eyes in three pairs; uniformly colored legs (no bands); velvety abdomen.
Similar Species
Kukulcania hibernalis (Southern House Spider), Tegenaria domestica (Barn Funnel Weaver), and various Wolf Spiders which have 8 eyes and banded legs.
Life Cycle
Females lay 1-5 egg sacs containing about 50 eggs each. They are long-lived for spiders, often surviving 1-2 years or more in stable indoor environments.
Ecological Importance
Provides excellent natural pest control by eating silverfish, moths, and cockroaches that reside in human dwellings.
Conservation Status
Not evaluated (IUCN); population is stable and widely distributed within its native range.
Interesting Facts
They can survive for several months without food or water. They are one of the few spiders that are truly 'reclusive,' often hiding in the same crevice for the duration of their adult life.
Photography Tips
A clear macro shot of the eyes (dyad arrangement) and the dorsal cephalothorax (violin mark) is necessary for definitive identification.
Identified: 2026-05-04T23:02:12.049879