Brown Recluse Spider, Violin Spider, Fiddleback Spider
Loxosceles reclusa
Sicariidae (Six-eyed Sicariid Spiders), Order Araneae. Key family characteristics include having only six eyes arranged in three dyads, rather than the typical eight eyes of most spiders.
Physical Description
The brown recluse has a distinctively uniform, delicate body structure consisting of a violin-shaped marking on the dorsal cephalothorax, with the neck of the fiddle pointing backward toward the abdomen. The abdomen is oval, covered in fine, short hairs, and lacks strong patterns.
Size Estimate
Body length typically ranges from 6 to 20 millimeters (about 0.25 to 0.75 inches), with a leg span reaching up to 25 to 30 millimeters (1 inch or slightly more). The specimen pictured appears to be an adult.
Coloration & Markings
Colors range from light tan to dark brown. The defining marking is the dark violin shape on the cephalothorax. Legs are uniformly colored without distinct bands, stripes, or strong spination.
Web Type
Does not build traditional orb or sheet webs for catching prey. Instead, constructs irregular, loose, sticky retreats or silken shelters in dark, secluded spaces such as behind furniture, in woodpiles, or basements.
Eye Arrangement
Uniquely possesses six eyes arranged in three distinct pairs (dyads): one pair centrally and a pair on each side, leaving a distinct gap between the dyads. This is a primary diagnostic feature of the family Sicariidae.
Leg Characteristics
Long, thin, delicate legs with fine hairs rather than heavy spines. They lack banding or distinct color rings and are held in a sprawling posture when resting or running.
Venom & Safety Information
Venom Information
Possesses a potent necrotic venom containing sphingomyelinase D, which destroys cell membranes and can cause localized tissue destruction (dermonecrosis) around the bite site.
Medical Significance
Medically significant. While many bites result in minor localized irritation, severe envenomation can cause deep necrotic skin lesions, ulceration, and systemic symptoms (loxoscelism), requiring medical evaluation and prompt professional treatment.
Safety Recommendations
Shake out shoes and clothing left on the floor, wear gloves when moving stored items in dark areas, seal entry points to the home, and safely relocate or remove specimens using a container and a piece of cardstock.
Habitat & Behavior
Habitat & Range
Native to the central and southern United States, ranging from the Midwest down to Texas and eastward to Georgia. Prefers dark, dry, undisturbed microhabitats like attics, basements, closets, and garages.
Behavior & Temperament
A nocturnal, timid hunter that actively forages for prey at night rather than waiting on a web. Highly reclusive, escaping from light or disturbance, and bites humans typically only when pressed against the skin.
Diet & Prey
Primarily preys on small insects such as cockroaches, crickets, silverfish, and other soft-bodied arthropods, hunting them down rather than trapping them.
Seasonal Activity
Most active during spring, summer, and early autumn when foraging for food and seeking mates. During winter, they typically seek shelter in protected indoor areas to overwinter.
Description
The brown recluse is one of North America's most misunderstood yet infamous spiders. Recognized immediately by the dark violin marking on its cephalothorax and its unusual six-eye arrangement, this nocturnal hunter prefers the quiet, undisturbed corners of human habitations, earning its common name through its shy, retiring demeanor.
Key Features
Presence of a dark violin-shaped marking on the dorsal cephalothorax, six eyes arranged in three pairs, uniform brown legs without banding, and a uniformly colored abdomen lacking distinct patterns.
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, leg spination, and the absence of the violin marking.
Life Cycle
Females produce several egg sacs containing 30 to 50 eggs each during the warm months. Spiderlings molt multiple times as they grow, and the species can live for 2 to 4 years, surviving long periods without food or water.
Ecological Importance
Acts as an effective nocturnal predator in controlling populations of household insect pests like cockroaches and silverfish, playing a role in natural pest management.
Conservation Status
Not evaluated by the IUCN, but populations are generally stable and abundant within their native geographic range.
Interesting Facts
Brown recluses can survive for months without food or water. They are remarkably resilient in indoor environments and their venom is exceptionally complex, containing enzymes specifically evolved to break down prey tissue.
Photography Tips
Photograph from a safe distance using macro lenses or zoom features. Focus on clear dorsal shots of the cephalothorax to capture the violin marking and eye arrangement, using natural lighting or soft diffused flash.
Identified: 2026-09-29T17:23:45.579447