Brown Recluse, Violin Spider, Fiddleback Spider
Loxosceles reclusa
Sicariidae (Six-eyed Sicarid Spiders), Order Araneae
Physical Description
A medium-sized spider with a relatively flat cephalothorax and an oval, uniform abdomen. The body is finely covered in short hairs, giving it a velvety appearance. It lacks thick spines on its legs and has no abdominal patterns save for the heart mark.
Size Estimate
Body length 6-20 mm (approx. 1/4 to 3/4 inch). Total leg span about the size of a U.S. quarter to a half-dollar.
Coloration & Markings
Generally light to medium brown. The most famous feature is the dark brown 'violin' or 'fiddle' shape on the dorsal side of the cephalothorax, with the neck of the violin pointing toward the spider's rear.
Web Type
Builds irregular, messy, off-white to gray 'tangle' webs. These are used for retreats rather than primary prey capture and are often found in undisturbed, dark corners.
Eye Arrangement
A defining characteristic: 6 eyes total, arranged in three pairs (dyads) in a semi-circle (U-shape) at the front of the head. Most spiders have 8 eyes.
Leg Characteristics
Long, slender legs with a uniform color. They lack heavy spines or distinct banding/stripes. Legs are held at a relatively flat angle relative to the body.
Venom & Safety Information
Venom Information
Cytotoxic and hemotoxic. Contains the enzyme sphingomyelinase D, which causes tissue necrosis (breakdown of skin and underlying tissue).
Medical Significance
Medically significant. While most bites result in minor redness, some develop into necrotic eschars. Severe systemic reactions (loxoscelism) are rare but can involve fever, chills, and organ damage.
Safety Recommendations
Shake out shoes and clothing stored in closets. Use glue traps in corners to monitor presence. If bitten, clean the wound, apply ice, elevate the area, and seek medical attention with the specimen if possible.
Habitat & Behavior
Habitat & Range
Primarily the Central and Midwestern United States. They prefer dark, dry, undisturbed areas such as crawlspaces, attics, basements, and behind furniture or inside rarely worn clothing.
Behavior & Temperament
Reclusive and shy; they typically run from threats rather than attack. Bites usually occur when the spider is accidentally pressed against skin, such as when putting on old clothes or shoes.
Diet & Prey
Generalist predator eating soft-bodied insects like crickets, moths, and cockroaches. They are active hunters at night, venturing away from their retreats to find prey.
Seasonal Activity
Active year-round in temperature-controlled homes, but peak activity and outdoor visibility occur from March through October during the warmer months.
Description
The Brown Recluse is one of the few spiders in North America with medically significant venom. It is characterized by its reclusive nature and iconic violin-shaped marking. Found mostly in the American South and Midwest, it prefers the quiet corners of human dwellings where it hunts insects at night.
Key Features
Violin marking on the cephalothorax; 6 eyes in 3 pairs; uniform-colored legs without spines; non-patterned abdomen.
Similar Species
Kukulcania hibernalis (Southern House Spider) - larger with longer pedipalps; Lycosidae (Wolf Spiders) - thicker legs and 8 eyes; Tegenaria (Hobo Spiders) - patterned abdomens.
Life Cycle
Females produce 1-5 egg sacs annually. Spiderlings emerge in roughly a month and take a year or more to reach maturity. Adults can live up to 2-4 years in the wild.
Ecological Importance
Serves as an important predator of indoor pests like silverfish, cockroaches, and flies, providing natural pest control in the home environment.
Conservation Status
Not evaluated by IUCN; populations are stable and locally abundant in the Central United States.
Interesting Facts
Brown Recluses are exceptionally resilient and can survive months without food or water. They are known for 'hitching rides' in moving boxes, which helps them expand their range.
Photography Tips
Focus on the 'head' area from a top-down angle to clearly document the eye arrangement (3 pairs) and the violin marking for definitive identification.
Identified: 2026-07-15T23:27:31.281116