Brown Recluse, Violin Spider, Fiddleback 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, velvety abdomen. It lacks spines on the legs and appears smooth but is covered in fine hairs (setae). The most diagnostic feature is the dark violin-shaped marking on the cephalothorax.
Size Estimate
Body length is typically 6-20mm (1/4 to 3/4 inch). With leg span, it can reach the size of a U.S. quarter or slightly larger. This specimen appears to be an adult.
Coloration & Markings
Uniformly light to medium brown or tan body with no stripes, bands, or spots on the legs. The core feature is a dark brown, violin-shaped mark on the dorsal side of the cephalothorax, with the neck of the violin pointing toward the abdomen.
Web Type
Builds irregular, asymmetrical 'tangle' webs of off-white or grayish silk. These are not used for catching prey but as retreats in undisturbed, dark locations like basements, attics, or woodpiles.
Eye Arrangement
Six eyes arranged in three pairs (dyads) in a semi-circle. This is a critical diagnostic feature as most spiders have eight eyes.
Leg Characteristics
Long, slender, and monochromatic brown. They lack thick spines/macrosetae (they have fine hairs only). When resting, the legs are often sprawled out in a flat posture.
Venom & Safety Information
Venom Information
Contains sphingomyelinase D, a cytotoxic (cell-destroying) protein. It can cause localized tissue death (necrosis). Systemic reactions are rare but can include 'loxoscelism'.
Medical Significance
Medically significant. Most bites result in minor redness and heal on their own, but a small percentage develop necrotic ulcers. Apply ice and seek medical attention if a lesion develops or for systemic symptoms.
Safety Recommendations
Shake out shoes and clothing stored in dark areas. Wear gloves when moving cardboard boxes or wood. Use adhesive traps for monitoring. If bitten, catch the spider for ID and use the R.I.C.E. (Rest, Ice, Compression, Elevation) method.
Habitat & Behavior
Habitat & Range
Primarily found in the Central and Midwestern United States (from Nebraska to Ohio and south to Texas and Georgia). They prefer dark, dry, undisturbed areas like closets, cardboard boxes, barns, and crevices.
Behavior & Temperament
A shy, reclusive, nocturnal hunter. They are not aggressive and usually only bite when pressed against skin (e.g., inside clothing or bedding). They are active hunters that leave their retreats at night.
Diet & Prey
Generalist predators feeding on soft-bodied insects like crickets, silverfish, and cockroaches. They also scavenge on dead insects, which is unusual for most spiders.
Seasonal Activity
Most active from March through October. During winter, they typically remain dormant in protected 'overwintering' retreats within structures.
Description
The Brown Recluse is a misunderstood but medically significant spider of the American Midwest. Known for its 'violin' marking and six-eye arrangement, it lives a quiet, nocturnal life in hidden corners. While it possesses potentially necrotizing venom, it is naturally avoidant of human contact and bites are infrequent.
Key Features
Violin-shaped mark on cephalothorax, six eyes in three pairs, uniformly colored legs without spines, and a shy demeanor.
Similar Species
Kukulcania hibernalis (Southern House Spider) - larger with longer pedipalps; Tegenaria domestica (Barn Funnel Weaver) - has striped legs and different markings; Dolomedes (Fishing Spiders) - much larger and more hairy.
Life Cycle
Females produce 1-5 egg sacs containing about 50 eggs each. Spiderlings reach maturity in about a year and can live 2 to 4 years. They are remarkably resilient to starvation and dehydration.
Ecological Importance
Act as significant natural pest controllers, especially in human dwellings where they eat cockroaches, silverfish, and other indoor pests.
Conservation Status
Not listed / Generally stable and common within their native range.
Interesting Facts
They can survive for over six months without food or water. Unlike most spiders, they actively scavenge on dead insects they find rather than just hunting live ones.
Photography Tips
Focus on the 'head' region to clearly capture the 'violin' mark and the eye arrangement. A top-down (dorsal) view is best for identification.
Identified: 2026-06-22T04:11:29.237984