Brown Recluse Spider, Fiddleback, Violin Spider
Loxosceles reclusa
Sicariidae (Six-eyed Sicariid Spiders), Order Araneae. Key family characteristics include a reduced number of eyes (six instead of the usual eight) arranged in three dyads.
Physical Description
The brown recluse features a uniform light brown to tan body with a distinct dark violin-shaped marking on its cephalothorax, pointing backward. It has long, slender, delicate legs without prominent banding or spines, and a velvety-textured oval abdomen.
Size Estimate
Body length typically ranges from 6 to 20 millimeters (about 1/4 to 3/4 inch), with a leg span up to 25 to 30 millimeters, making it a medium-small spider.
Coloration & Markings
Colors range from yellowish-tan to dark brown. The defining marking is the dark violin-shaped pattern on the dorsal side of the cephalothorax. The abdomen is uniformly colored, lacking stripes or distinct patterns.
Web Type
They do not build traditional orb webs to catch prey. Instead, they spin irregular, loose, sticky retreats or retreat webs in dark, sheltered areas, often using them as daytime hiding spots.
Eye Arrangement
Uniquely possesses six eyes arranged in three pairs (dyads) forming a semicircle: a pair of anterior median eyes and two lateral pairs, which is a key diagnostic feature for the Sicariidae family.
Leg Characteristics
Legs are long, thin, uniform in color, and lack prominent spines or visual banding. They are held in a flattened, sprawling posture when at rest.
Venom & Safety Information
Venom Information
Possesses a potent necrotic (cytotoxic) venom containing the enzyme sphingomyelinase D, which destroys cell membranes and can cause localized tissue destruction.
Medical Significance
Medically significant. While many bites result in minor red marks that heal without complication, some envenomations can cause necrotic lesions (dermonecrotic arachnidism) requiring medical attention. Systemic symptoms are rare.
Safety Recommendations
Shake out shoes and clothing left on the floor, wear gloves when moving stored items or firewood, and seal cracks in home foundations. If bitten, clean the area and seek medical evaluation.
Habitat & Behavior
Habitat & Range
Found primarily in the central and southern United States, extending from the Midwest down to Texas and eastward to Georgia. Prefers dry, dark, undisturbed environments such as woodpiles, basements, attics, closets, and behind furniture.
Behavior & Temperament
Reclusive, nocturnal hunters that actively forage at night. They are non-aggressive and typically bite only when trapped against human skin, such as when putting on clothing or rolling over in bed.
Diet & Prey
Primarily feeds on small insects such as cockroaches, crickets, and other soft-bodied arthropods, which they hunt and subdue with potent venom.
Seasonal Activity
Most active during spring and summer months when hunting and mating occur. During winter, they seek shelter indoors or in deep protected crevices.
Description
The brown recluse is a quintessential nocturnal dweller known for its distinct violin marking. While often feared, it lives up to its name by hiding away from human activity, playing a vital role in controlling household and outdoor insect populations.
Key Features
Distinct dark violin-shaped marking on the cephalothorax, six eyes arranged in three pairs, uniform brown coloration without abdominal patterns, and long, slender legs.
Similar Species
Cellar spiders (Pholcidae), grass spiders (Agelenidae), and male southern house spiders (Kukulcania hibernalis) are often mistaken for brown recluses. They can be distinguished by examining the eye pattern and the absence of the violin marking.
Life Cycle
Females produce several egg sacs containing up to 50 eggs each during the warm months. Spiderlings molt several times before reaching maturity, with a potential lifespan of 1 to 2 years.
Ecological Importance
Acts as an effective natural pest controller in its native range, regulating populations of nuisance insects like roaches and crickets.
Conservation Status
Not evaluated by the IUCN, but populations are generally stable and robust throughout their native geographic range.
Interesting Facts
Brown recluses can survive for months without food or water. Despite their reputation, they actively flee from disturbances rather than attack.
Photography Tips
Use a macro lens with a diffuser for even lighting. Maintain a safe distance, focus on the dorsal cephalothorax to capture the violin pattern, and photograph the eye arrangement if possible using a high-magnification setup.
User Notes
side of house
Identified: 2026-10-27T22:36:26.353651