Brown Recluse, Violin Spider, Fiddleback Spider
Loxosceles reclusa
Sicariidae (Six-eyed Sicariid Spiders), Order Araneae
Physical Description
A medium-sized spider with a relatively flat cephalothorax and an oval-shaped abdomen. The body is covered in fine, short hairs giving it a velvety texture. Unlike many spiders, the abdomen is uniform in color without spines or distinct patterns, other than the violin shape on the head region.
Size Estimate
Body length is typically 6-20mm (1/4 to 3/4 inch). With legs extended, the total span is roughly the size of a United States quarter to a half-dollar.
Coloration & Markings
Characterized by a light to medium brown tan color. The most diagnostic marking is a dark brown 'violin' or 'fiddle' shape on the dorsal side of the cephalothorax, with the neck of the violin pointing toward the abdomen.
Web Type
Builds irregular, asymmetrical 'tangle' webs. These are white or off-white and often hidden in dark, undisturbed corners. They are not used to snare prey but serve as a retreat.
Eye Arrangement
Uniquely possesses only 6 eyes arranged in three pairs (dyads) in a semi-circle across the front of the cephalothorax. Most other spiders have 8 eyes.
Leg Characteristics
The legs are long, slender, and monochromatic, matching the body color. They lack thick spines but are covered in fine hairs. In a resting position, the legs are often sprawled out to the sides.
Venom & Safety Information
Venom Information
Possesses a potent necrotic venom containing the enzyme sphingomyelinase D. This venom can cause Tissue death (necrosis) at the bite site.
Medical Significance
Medically significant. While most bites result in minor redness, some can develop into a necrotic ulcer known as loxoscelism. Systemic reactions (fever, chills) are rare but serious. Seek medical attention if a bite is suspected.
Safety Recommendations
Shake out shoes and clothing stored in dark areas. Use glue traps for monitoring. Avoid reaching into dark corners without gloves. If bitten, clean the wound, apply ice, and seek medical evaluation.
Habitat & Behavior
Habitat & Range
Primarily found in the Central and Midwestern United States. They prefer dark, dry, undisturbed locations such as basements, attics, woodpiles, closets, and inside cardboard boxes.
Behavior & Temperament
As the name suggests, they are reclusive and nocturnal. They are not aggressive and typically flee when threatened. Bites usually occur when the spider is pressed against skin, such as inside clothing or bedding.
Diet & Prey
Active hunters that leave their web at night to search for food. They primarily eat cockroaches, silverfish, crickets, and other small crawling insects.
Seasonal Activity
Most active from March through October. During winter, they often remain dormant in wall voids or insulated areas.
Description
The Brown Recluse is one of the most misunderstood and feared spiders in North America. Identifiable by its uniform color and iconic violin marking, this shy arachnid plays a significant role in controlling indoor pest populations. Despite their reputation, they avoid human contact whenever possible.
Key Features
Trio of eye pairs (6 eyes total), violin-shaped marking on the cephalothorax, uniformly colored abdomen and legs with no banding.
Similar Species
Often confused with Tegenaria (Hobo spiders) or Kukulcania (Southern House Spiders). Kukulcania is larger and lacks the specific 6-eye pattern. Grass spiders have distinct stripes and long spinnerets which Recluses lack.
Life Cycle
Females produce 1 to 5 egg sacs containing roughly 50 eggs each. They can live 1 to 2 years in the wild, but have been known to survive much longer in laboratory settings. They are remarkably hardy and can survive long periods without food or water.
Ecological Importance
Critical for natural pest management within homes and structures, feeding on many common household pests that carry bacteria or damage property.
Conservation Status
Not listed on the IUCN Red List; they are common and widespread in their native range.
Interesting Facts
A Brown Recluse can go months without food and is exceptionally resilient to extreme temperatures. They are one of the few spiders whose venom can cause significant skin lesions in humans.
Photography Tips
A top-down clear shot of the 'head' (cephalothorax) is essential to see the violin marking and eye arrangement for a definitive ID. Use a ruler or coin nearby for scale.
Identified: 2026-05-04T22:58:39.160274