Brown Recluse Spider, Fiddleback Spider, Violin Spider
Loxosceles reclusa (or similar Loxosceles species)
Sicariidae (Six-eyed Sicariid Spiders), Order Araneae. Key family characteristics include having six eyes arranged in three dyads and a specialized venom profile.
Physical Description
The spider has a somewhat flattened body with a distinct violin-shaped marking on the dorsal cephalothorax. The body is divided into a clean, unpatterned cephalothorax and an oblong, velvety abdomen.
Size Estimate
Body length typically ranges from 6 to 20 millimeters, with a leg span of about 20 to 30 millimeters. The specimen in the provided low-detail image appears to be a medium-sized adult or subadult.
Coloration & Markings
Colors range from yellowish-tan to dark brown. The definitive marking is the darker violin shape on the cephalothorax with the neck pointing toward the rear. The abdomen is uniformly colored without distinct stripes or chevrons.
Web Type
Irregular, loose, sticky retreat webs spun in dark, undisturbed places rather than decorative orb webs.
Eye Arrangement
Six eyes arranged in three distinct pairs (dyads): one pair centrally and a pair on each side, which is a hallmark of the Sicariidae family.
Leg Characteristics
Long, thin, delicate legs of a uniform color lacking prominent spines or strong banding patterns, typically held in a sprawling posture.
Venom & Safety Information
Venom Information
Potent necrotic venom containing the enzyme sphingomyelinase D, which can cause localized tissue destruction and dermonecrotic lesions.
Medical Significance
Medically significant. Bites can cause severe local reactions, including ulceration and tissue necrosis, requiring professional medical evaluation and wound care.
Safety Recommendations
Shake out shoes and clothing left on the floor, wear gloves when handling stored items in dark areas, and safely relocate or eliminate individuals using professional pest control if infestations occur.
Habitat & Behavior
Habitat & Range
Found primarily in the central and southern United States, inhabiting dark, dry, undisturbed areas such as woodpiles, basements, closets, and attics.
Behavior & Temperament
Noxious, nocturnal, and reclusive hunters. They actively avoid light and human contact, only biting when trapped against the skin.
Diet & Prey
Carnivorous predators feeding primarily on small insects such as roaches, crickets, and other crawling arthropods.
Seasonal Activity
Most active during the warm spring and summer months, though they remain active year-round indoors and in heated structures.
Description
A notoriously misunderstood nocturnal dweller, the brown recluse is adapted to living in hidden crevices and corners. While possessing a potent necrotic venom, it rarely bites unless pressed directly against the human body, serving as an effective natural pest controller in undisturbed niches.
Key Features
Six eyes arranged in pairs, a distinct violin-shaped marking on the cephalothorax, uniform brown legs, and an absence of strong abdominal patterns.
Similar Species
Cellar spiders (Pholcidae), funnel-weavers (Agelenidae), and other non-venomous brown spiders, which can be distinguished by having eight eyes and different body proportions.
Life Cycle
Females produce several egg sacs containing around 50 eggs each during the warmer months. Spiderlings molt several times before reaching maturity, with a potential lifespan of 1 to 3 years.
Ecological Importance
Acts as an apex predator among household and woodland micro-invertebrates, helping to naturally regulate populations of common insect pests.
Conservation Status
Not evaluated by the IUCN, but populations are secure and widespread within their native geographic range.
Interesting Facts
Brown recluses can survive for months without food or water, and their specialized venom is uniquely adapted to rapidly immobilize hard-bodied insect prey.
Photography Tips
Use macro lenses with adequate artificial lighting to clearly capture the eye arrangement and the dorsal violin pattern, maintaining a safe distance and avoiding direct handling.
User Notes
On the floor
Identified: 2026-07-31T22:09:09.093973