Brown Recluse Spider, Violin Spider, Fiddleback Spider
Loxosceles reclusa
Sicariidae (Six-eyed Sicariid Spiders), Order Araneae. Key family characteristics include the unique arrangement of six eyes in three dyads.
Physical Description
The brown recluse features a distinctively uniform or slightly patterned body with a violin-shaped marking on the dorsal cephalothorax, with the neck of the fiddle pointing backward. The abdomen is oval, covered in fine, short hairs, and lacks strong contrasting patterns.
Size Estimate
Body length typically ranges from 6 to 20 millimeters, with a leg span around 20 to 25 millimeters. The specimen shown appears to be a medium-to-large adult.
Coloration & Markings
Colors range from yellowish-tan to dark brown. The definitive marking is the dark violin shape on the cephalothorax. The legs are generally uniform in color without distinct bands or stripes.
Web Type
Does not build an orb or catching web. Instead, they construct irregular, loose retreat webs in secluded, undisturbed areas, which are used primarily as daytime shelters.
Eye Arrangement
Possesses six eyes arranged in three pairs (dyads): one pair centrally and a pair on each side, which is a key diagnostic feature separating this family from most other spiders that have eight eyes.
Leg Characteristics
Legs are long, slender, and uniformly colored without spines or banding. When at rest or threatened, they often adopt a sprawling, defensive posture.
Venom & Safety Information
Venom Information
Necrotoxic venom containing sphingomyelinase D, which destroys cell membranes and can cause localized tissue destruction (necrotic lesions) at the bite site.
Medical Significance
Medically significant. While many bites result in mild skin irritation or go unnoticed, severe envenomation can cause localized necrosis requiring medical treatment and careful monitoring to prevent secondary infection.
Safety Recommendations
Shake out shoes and clothing left on the floor, wear gloves when moving stored items, seal cracks in foundations, and gently relocate individuals outdoors using a container if found.
Habitat & Behavior
Habitat & Range
Found primarily in the central and southern United States. Prefers dark, dry, undisturbed microhabitats such as woodpiles, basements, attics, closets, and behind furniture.
Behavior & Temperament
Reclusive, nocturnal, and non-aggressive. They typically bite only when trapped against human skin, such as when putting on clothing or rolling over in bed.
Diet & Prey
Primarily preys on small insects such as cockroaches, crickets, and other household pests, hunting them actively near their retreat or ambushing them.
Seasonal Activity
Most active during spring and summer months, though they can remain active year-round in temperature-controlled indoor environments.
Description
The brown recluse is a famously misunderstood spider known for its distinctive violin-shaped marking and secretive lifestyle. Preferring dark and quiet corners, it plays a quiet role in controlling household insect populations while requiring cautious coexistence.
Key Features
Uniformly colored legs without bands, a violin-shaped marking on the cephalothorax, and exactly six eyes arranged in three pairs.
Similar Species
Cellar spiders (Pholcidae), grass spiders (Agelenidae), and male southern house spiders (Kukulcania hibernalis). These can be distinguished by examining the eye pattern and checking for the violin marking.
Life Cycle
Females produce several egg sacs containing around 30 to 50 eggs each during the warm months. Spiderlings molt multiple times and can live for several years in optimal conditions.
Ecological Importance
Acts as an effective natural pest control agent by keeping populations of household and outdoor insects in check.
Conservation Status
Not evaluated by the IUCN, but populations are generally stable and robust within their native geographic range.
Interesting Facts
Brown recluses can survive for months without food or water, and their venom contains specialized enzymes that break down tissues to aid in digestion.
Photography Tips
Photograph from a safe distance using macro lenses with good lighting to highlight the eye arrangement and the cephalothorax pattern without provoking the spider.
Identified: 2026-08-23T00:30:16.172908