Brown Recluse Spider, Fiddleback Spider, Violin Spider
Loxosceles reclusa
Sicariidae (Six-eyed Sicariid Spiders), Order Araneae. Key family characteristics include the presence of six eyes arranged in three dyads and a tendency to build irregular sheet webs in hidden retreats.
Physical Description
The brown recluse features a uniform, violin-shaped marking on its cephalothorax with the neck pointing toward the abdomen. The body has a smooth appearance with very fine, short hairs rather than prominent spines.
Size Estimate
Body length ranges from 6 to 20 millimeters (approximately 0.25 to 0.75 inches), with a total leg span reaching up to 20 to 30 millimeters (around 1 inch). This specimen appears to be an adult.
Coloration & Markings
Colors range from yellowish-tan to dark brown. The defining marking is the dark violin shape on the dorsal carapace. The abdomen is uniformly colored without bands, stripes, or contrasting spots.
Web Type
Builds irregular, sticky, off-white or grayish silk retreat webs constructed in dark, undisturbed places rather than formal orb or sheet webs designed for aerial capture.
Eye Arrangement
Possesses six eyes arranged in three pairs (dyads) forming a semicircle: one pair in front and two pairs along the sides. This is a crucial diagnostic trait separating Sicariidae from most other spider families which have eight eyes.
Leg Characteristics
Legs are long, slender, and uniformly colored without visible banding or strong spines. They tend to spread out widely when resting or running.
Venom & Safety Information
Venom Information
Contains a potent necrotic venom primarily composed of the enzyme sphingomyelinase D, which destroys cell membranes, leading to localized tissue destruction and slow-healing dermonecrotic lesions.
Medical Significance
Medically significant. While many bites result in mild skin irritation or go unnoticed, severe envenomation can cause localized necrosis (the 'violin spider' lesion), requiring medical evaluation and wound management.
Safety Recommendations
Shake out shoes and clothing left on the floor, wear gloves when moving stored items in dark areas, and safely relocate individuals using a container and piece of paper.
Habitat & Behavior
Habitat & Range
Native to the central and southern United States, ranging from the Midwest down to the Gulf Coast. Prefers dark, dry, undisturbed microhabitats such as woodpiles, basements, closets, attics, and behind furniture.
Behavior & Temperament
Reclusive, nocturnal hunters that actively forage for prey away from their retreat webs. They are non-aggressive and typically bite only when trapped against human skin, such as inside clothing or shoes.
Diet & Prey
Feeds primarily on small insects such as cockroaches, crickets, and other soft-bodied arthropods captured during nocturnal hunting forays.
Seasonal Activity
Most active during spring and summer months, though they remain active year-round indoors in climate-controlled buildings.
Description
The brown recluse is one of North America's most misunderstood and recognized spiders. Distinguished by its signature violin marking and unique six-eye arrangement, this shy arachnid plays an important role in controlling indoor and outdoor insect populations.
Key Features
Uniformly colored brown body, violin-shaped marking on the cephalothorax, six eyes arranged in three dyads, and the complete lack of spines or bands on the legs.
Similar Species
Cellar spiders (Pholcidae), grass spiders (Agelenidae), and wolf spiders (Lycosidae) are frequently confused with the brown recluse, but they possess eight eyes, banded legs, or distinct abdominal patterns.
Life Cycle
Females produce several egg sacs containing around 30 to 50 eggs during the warmer months. Spiderlings go through multiple molts before reaching maturity, with a potential lifespan of 1 to 3 years.
Ecological Importance
Serves as an effective predator of household and agricultural pests, helping regulate insect populations within its native range.
Conservation Status
Not evaluated by the IUCN, but populations are secure and widespread within their natural geographic distribution.
Interesting Facts
Brown recluses can survive for months without food or water, and their venom contains specialized enzymes evolved specifically to rapidly digest prey tissue.
Photography Tips
Use a macro lens with adequate, diffuse lighting to clearly capture the dorsal cephalothorax and the eye arrangement without provoking the spider.
Identified: 2026-10-18T18:04:09.145561