Brown Recluse Spider, Violin Spider, Fiddleback
Loxosceles reclusa
Sicariidae, Order Araneae. Key family characteristics include having six eyes arranged in three dyads and lacking claw tufts.
Physical Description
The brown recluse features a uniform light brown to dark brown body with a distinct violin-shaped marking on its cephalothorax, pointing toward the abdomen. The abdomen is oval and uniformly colored without striking patterns, and the legs are long and thin.
Size Estimate
Body length is typically 6 to 20 millimeters (0.24 to 0.79 inches), with a leg span ranging from 20 to 30 millimeters. This specimen appears to be an adult or sub-adult.
Coloration & Markings
Light brown to yellowish-tan background color. The primary diagnostic marking is the dark brown violin shape on the dorsal cephalothorax. The abdomen is plain tan or grayish without bands or stripes.
Web Type
Irregular, sticky retreat webs spun in dark, undisturbed places such as cracks, crevices, and behind furniture, rather than symmetrical orb webs.
Eye Arrangement
Six eyes arranged in three pairs (dyads) in a semicircle on the anterior portion of the cephalothorax, which is a key identifying feature of the Sicariidae family.
Leg Characteristics
Long, thin, uniformly colored legs without conspicuous spines or prominent dark banding. They lack the hairy or banded appearance common in wolf spiders.
Venom & Safety Information
Venom Information
Contains necrotic cytotoxins (specifically sphingomyelinase D) which can cause tissue destruction at the site of the bite.
Medical Significance
Medically significant. Bites can result in severe necrotic lesions, ulceration, and systemic symptoms (loxoscelism), requiring medical evaluation.
Safety Recommendations
Shake out shoes and clothing left on the floor, wear gloves when moving stored items, and seal cracks in walls to prevent entry.
Habitat & Behavior
Habitat & Range
Found primarily in the Midwestern and Southern United States. Prefers warm, dry, and dark locations such as woodpiles, basements, attics, closets, and behind stored items.
Behavior & Temperament
Nocturnal hunters that actively forage away from their retreat webs. They are non-aggressive and typically bite only when trapped against the skin.
Diet & Prey
Insects such as cockroaches, crickets, and other small arthropods, which they hunt and subdue with potent venom.
Seasonal Activity
Most active during spring, summer, and early autumn when temperatures are warm; they seek indoor shelter during colder months.
Description
The brown recluse spider is a medically significant arachnid known for its characteristic violin-shaped marking. Though reclusive and rarely aggressive, they can inhabit human dwellings, making cautious handling of stored items important.
Key Features
Six eyes in three pairs, a distinct violin marking on the cephalothorax, and uniformly colored, unbanded legs.
Similar Species
Cellar spiders (Pholcidae), grass spiders (Agelenidae), and wolf spiders (Lycosidae). These can be distinguished by having eight eyes, different leg proportions, or distinct body patterns.
Life Cycle
Females produce several white silk egg sacs containing around 50 eggs each during the warm months. Spiderlings molt multiple times before reaching maturity. Lifespan can be up to 2 to 3 years.
Ecological Importance
Acts as an effective natural pest control agent by preying on household and garden insect populations.
Conservation Status
Not evaluated by the IUCN, but populations are secure and widespread within their native range.
Interesting Facts
Brown recluses can survive for months without food or water, and their silk is used primarily for retreats rather than capturing prey.
Photography Tips
Use a macro lens with adequate lighting while maintaining a safe distance. Capture the dorsal view to clearly show the violin pattern and the eye arrangement.
Identified: 2026-08-10T01:06:59.157166