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 distinct dyads.
Physical Description
The brown recluse features a uniform light brown to tan body with a distinctive dark violin-shaped marking on its cephalothorax, the neck of the violin pointing backward. The abdomen is oval, covered in fine, short hairs, and lacks strong patterns or bands.
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 (0.79 to 1.18 inches). The specimen shown appears to be a typical adult or subadult.
Coloration & Markings
Body colors range from yellowish-tan to dark brown. The most notable marking is the dark violin-shaped pattern on the dorsal carapace. Legs are a uniform light brown without any distinct banding or spination visible to the naked eye.
Web Type
Does not build traditional orb webs. Instead, it constructs a disorganized, irregular, sticky retreat web usually located in dark, undisturbed areas such as crevices, under rocks, or behind furniture.
Eye Arrangement
Possesses six eyes arranged in three pairs (dyads) forming a semicircle on the front of the cephalothorax: one pair in front and two lateral pairs, which is a key diagnostic feature for the Sicariidae family.
Leg Characteristics
Long, thin, delicate legs covered in fine hairs rather than prominent spines. They lack color banding or distinct patterns, and the spider often holds them outstretched when resting on vertical surfaces.
Venom & Safety Information
Venom Information
Contains a potent cytotoxic venom containing the enzyme sphingomyelinase D, which destroys cell membranes and can lead to dermonecrotic lesions.
Medical Significance
Medically significant. While many bites result in mild skin irritation, some can cause localized tissue necrosis, ulceration, and slow-healing wounds requiring medical attention.
Safety Recommendations
Shake out shoes and clothing left on the floor, wear gloves when moving stored items in dark areas, and safely relocate indoor spiders using a container and piece of paper.
Habitat & Behavior
Habitat & Range
Native to the central and southern United States, ranging from the Midwest down to Texas and east to Georgia. Prefers dry, sheltered microhabitats such as woodpiles, basements, attics, and closets.
Behavior & Temperament
Nocturnal and reclusive hunting spider. They actively forage for prey at night and retreat to dark crevices during the day. They are non-aggressive and typically bite only when trapped against the skin.
Diet & Prey
Primarily preys on small insects such as cockroaches, crickets, and other soft-bodied arthropods, actively hunting them down or ambushing them near its retreat.
Seasonal Activity
Most active during spring, summer, and early autumn. During colder winter months, they seek shelter indoors or hibernate in protected microhabitats.
Description
The brown recluse is a famously misunderstood synanthropic spider found commonly in homes within its native range. Known for its violin-shaped marking, it is an efficient nocturnal hunter that prefers solitude and dark corners, rarely interacting with humans unless accidentally compressed.
Key Features
Six eyes arranged in three pairs, uniform brown coloration, and the distinct dark violin-shaped marking on the dorsal cephalothorax.
Similar Species
Cellar spiders (Pholcidae), male southern house spiders (Kukulcania hibernalis), and wolf spiders (Lycosidae). These can be distinguished by examining the eye pattern, lack of the violin marking, and different body proportions.
Life Cycle
Females produce several spherical, off-white egg sacs containing dozens of eggs during the warmer months. Spiderlings molt several times before reaching maturity, and the lifespan can exceed one to two years.
Ecological Importance
Serves as an effective natural pest controller by reducing populations of household insects and other arthropods within its ecosystem.
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, and their venom contains specialized enzymes evolved primarily to rapidly digest insect tissue.
Photography Tips
Use a macro lens with a soft ring light or diffused flash, maintain a safe working distance, and capture dorsal views to clearly show the eye arrangement and violin marking.
Identified: 2026-09-26T16:05:59.034158