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 abdomen. The body is finely haired with a velvety texture. Its most distinctive feature is a dark, violin-shaped mark on the cephalothorax, with the 'neck' of the violin pointing toward the abdomen.
Size Estimate
The body length is typically 6-20mm (1/4 to 3/4 inch), with a leg span approximately the size of a U.S. quarter to a half-dollar. This specimen appears to be an adult.
Coloration & Markings
Uniformly light to medium brown or tan body and legs, lacking Mottling or stripes. The abdomen is typically a solid grayish-brown or cream color. The darker brown 'violin' marking on the dorsal cephalothorax is the primary identifier.
Web Type
Builds irregular, haphazard, 'messy' retreat webs in dark, undisturbed areas. They do not use webs to catch prey but rather as a home base; they are active hunters at night.
Eye Arrangement
Uniquely possesses six eyes arranged in three pairs (dyads) in a semi-circle: one median pair and two lateral pairs. Most spiders have eight eyes.
Leg Characteristics
Long, slender, and monochromatic brown legs without visible spines or banding. The legs are covered in very fine hairs that give them a smooth appearance to the naked eye.
Venom & Safety Information
Venom Information
Contains a potent cytotoxic (tissue-destroying) enzyme called sphingomyelinase D. The venom can cause local tissue necrosis (dermonecrotic lesion), though systemic reactions are rare.
Medical Significance
Medically significant. While most bites are minor and heal without intervention, some can lead to necrotic ulcers or, rarely, systemic loxoscelism. Seek medical attention if a bite is suspected.
Safety Recommendations
Shake out shoes and clothing left on the floor. Wear gloves when moving wood or boxes in storage. Use sticky traps for monitoring. If a bite occurs, clean with soap and water and apply ice.
Habitat & Behavior
Habitat & Range
Primarily found in the Central and Southeastern United States (from Nebraska to Ohio and south to Texas and Florida). They prefer dark, dry, undisturbed microhabitats such as basements, attics, woodpiles, and behind furniture.
Behavior & Temperament
Extremely reclusive and non-aggressive. They prefer to flee rather than bite. Most bites occur when the spider is accidentally pressed against human skin, such as inside clothing, shoes, or bedding.
Diet & Prey
Nocturnal hunters that seek out soft-bodied insects like silverfish, crickets, and cockroaches. They are also known to scavenge on dead insects.
Seasonal Activity
Active year-round indoors, but most visible and active during the warmer months (March through October) which coincides with their mating season.
Description
The Brown Recluse is a misunderstood architect of the shadows. Famous for its 'violin' mark, it is a shy creature that avoids human interaction, providing natural pest control in the hidden corners of homes and outbuildings.
Key Features
Consistent light brown color, six eyes in three pairs, violin-shaped marking on cephalothorax, and legs without spines.
Similar Species
Kukulcania hibernalis (Southern House Spider), Tegenaria domestica (Barn Funnel Weaver), and various Wolf Spiders (Lycosidae). These similar spiders usually have eight eyes, banded legs, or visible spines.
Life Cycle
Females produce 1-5 egg sacs containing about 50 eggs each. Spiderlings reach maturity in about one year. They are remarkably resilient and can live for 1 to 2 years, even in harsh conditions without food.
Ecological Importance
Acts as an effective predator of common household pests, including cockroaches and silverfish, maintaining balance in indoor and outdoor micro-ecosystems.
Conservation Status
Not listed by the IUCN. Populations are stable and they are considered synanthropic (living closely with humans).
Interesting Facts
Brown Recluses can survive for months without food or water. They are one of the few spiders with a necrotic venom capable of causing skin lesions in high doses.
Photography Tips
Focus on the cephalothorax to capture the violin mark and eye arrangement. Overhead shots are best for identification. Use a macro lens if possible but maintain a safe distance.
Identified: 2026-06-22T13:26:07.400855