Brown Recluse, Violin Spider, Fiddleback Spider
Loxosceles reclusa
Sicariidae (Six-eyed Sicarid Spiders), Order Araneae. Characterized by possessing six eyes arranged in three pairs (dyads) and a flattened body.
Physical Description
A medium-sized spider with a distinctive flattened cephalothorax and an oval-shaped abdomen. The body is covered in fine, short hairs giving it a velvety appearance. It lacks thick spines on the legs. Sexual dimorphism is present; females have larger abdomens while males have longer legs and bulbous pedipalps.
Size Estimate
Estimated body length 6-12mm (1/4 to 1/2 inch) with a leg span of roughly 25-40mm (1 to 1.5 inches). This specimen appears to be an adult.
Coloration & Markings
Uniformly light tan to dark brown with no banding on the legs. The most diagnostic 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. Webs are generally used for retreat rather than prey capture and are hidden in dark, undisturbed corners.
Eye Arrangement
Uniquely possesses six eyes arranged in three pairs (dyads) in a semi-circle: one median pair and two lateral pairs. This is a critical diagnostic feature as most spiders have eight eyes.
Leg Characteristics
Long, slender legs that are held at a relatively flat angle. The legs are monochromatic (no bands or stripes) and lack conspicuous spines, though they are covered in fine hairs.
Venom & Safety Information
Venom Information
Contains a potent cytotoxic (cell-destroying) protein called sphingomyelinase D. This venom can cause necrosis (tissue death) and, in rare cases, systemic reactions.
Medical Significance
Medically significant. Bites may result in a 'bullseye' lesion, localized pain, and necrotic skin ulcers. While most bites heal without complication, severe cases require medical attention. Deaths are extremely rare and usually limited to children or the elderly.
Safety Recommendations
Shake out shoes and clothing stored in dark areas before use. Use glue traps for monitoring and reduction. To relocate, use a jar and stiff paper to avoid direct contact. If bitten, apply ice and seek medical evaluation.
Habitat & Behavior
Habitat & Range
Commonly found in the Central and Southern United States (from Nebraska to Ohio, and south to Texas and Florida). They prefer dark, dry, undisturbed areas such as attics, basements, closets, woodpiles, and behind baseboards.
Behavior & Temperament
Reclusive and nocturnal. They are not aggressive and typically only bite when pressed against skin (e.g., inside clothing or bedding). They are active hunters at night, wandering to find prey rather than waiting in webs.
Diet & Prey
Feeds on a variety of soft-bodied insects like silverfish, crickets, and cockroaches. They are known for being scavenger-hunters, sometimes feeding on insects they find already dead.
Seasonal Activity
Most active during the warmer months (March through October). During winter, they often overwinter in wall voids or insulation in a state of reduced activity.
Description
An infamous yet often misunderstood resident of American homes, the Brown Recluse is a master of stealth. It is easily identified by its violin marking and 'tri-diad' eye pattern. Despite its reputation, it prefers to avoid human contact entirely, sticking to the shadows of human dwellings where it provides natural pest control.
Key Features
Violin-shaped marking on cephalothorax; six eyes in three pairs (dyads); uniformly colored legs without bands; fine, velvety hairs.
Similar Species
Cellar Spiders (Pholcidae) have much longer, thinner legs; Southern House Spiders (Kukulcania hibernalis) are larger and have long pedipalps; Wolf Spiders (Lycosidae) have eight eyes and thicker, spiny legs.
Life Cycle
Females produce 1-5 egg sacs containing 40-50 eggs each. Spiderlings reach maturity in about a year and are remarkably long-lived for their size, reaching up to 2-4 years in some environments.
Ecological Importance
Plays a vital role in controlling indoor pest populations, particularly silverfish and cockroach nymphs, reducing the need for chemical pesticides.
Conservation Status
Not listed on the IUCN Red List. Populations are stable and highly adapted to human-modified environments.
Interesting Facts
The Brown Recluse can survive for six months or more without food or water. Unlike many spiders, their silk is not sticky; it is used primarily for structural retreats rather than trapping.
Photography Tips
Focus on the 'violin' mark on the head and try to get a clear macro shot of the eye arrangement (front-facing) to confirm the three pairs of eyes.
Identified: 2026-06-26T04:31:39.870250