Brown Recluse, Violin Spider, Fiddleback Spider
Loxosceles reclusa
Sicariidae (Six-eyed Sicariid Spiders), Order Araneae
Physical Description
A medium-sized spider with a relatively flat cephalothorax and an oval-shaped abdomen. The body is covered in short, fine hairs, giving it a velvety, matte appearance rather than a shiny one. They lack spines on their legs, possessing only fine hairs. This specimen shows the classic long, slender legs and distinct body segments.
Size Estimate
Body length is approximately 6-12 mm (1/4 to 1/2 inch) with a total leg span reaching about 25-30 mm (around 1 inch). This appears to be a sub-adult or adult specimen.
Coloration & Markings
Uniformly light tan to dark brown abdomen without any spots or stripes. The cephalothorax features a darker, neck-down violin-shaped marking (the 'fiddle'). The legs are solid colored with no banding or contrasting patterns.
Web Type
Builds irregular, asymmetrical 'tangle' webs. These are not used for hunting but as retreats. They are typically hidden in dark, undisturbed areas like closets, basements, or woodpiles.
Eye Arrangement
Six eyes arranged in three pairs (dyads) in a semi-circle. This is a primary diagnostic feature differentiating them from most eight-eyed spiders, though difficult to see without magnification.
Leg Characteristics
The legs are long, slender, and held at a relatively flat angle to the body. They are uniformly colored (no bands) and lack heavy spines, unlike wolf spiders or grass spiders.
Venom & Safety Information
Venom Information
Possesses a cytotoxic (cell-destroying) venom containing the enzyme sphingomyelinase D. This can cause necrosis (tissue death) at the site of the bite.
Medical Significance
Medically significant. Most bites result in minor redness, but a small percentage develop a necrotic 'bullseye' lesion. Systemic reactions (loxoscelism) are rare but serious. Seek medical attention if a necrotic sore develops.
Safety Recommendations
Shake out shoes and clothing left on the floor. Use glue traps in dark corners to monitor populations. If found, relocate using a glass and stiff paper. Do not handle with bare hands.
Habitat & Behavior
Habitat & Range
Primarily found in the Central and Midwestern United States. They prefer dark, dry, undisturbed microhabitats such as cardboard boxes, behind baseboards, in attics, and under rocky debris outdoors.
Behavior & Temperament
Reclusive, nocturnal, and non-aggressive. They prefer to flee rather than bite. Bites usually occur when the spider is pressed against skin (e.g., inside clothing, shoes, or bedding).
Diet & Prey
Active nocturnal hunters that leave their webs to search for prey. They primarily eat small insects like crickets, silverfish, and cockroaches. They are also known to scavenge dead insects.
Seasonal Activity
Active year-round indoors, but most sightings occur during spring and summer (March to October) when males wander in search of mates.
Description
The Brown Recluse is a shy but medically significant spider often found in human dwellings. Recognizable by its sandy-brown color and violin-shaped marking, it is a master of hiding in the shadows. While feared, it is an important predator of indoor pests.
Key Features
Violin-shaped marking on cephalothorax, six eyes in three pairs, uniformly colored legs without spines, and a solid-colored abdomen.
Similar Species
Wolf Spiders (Lycosidae) - have 8 eyes and spines on legs; Cellar Spiders (Pholcidae) - have very long, thin legs and segmented abdomens; Kukulcania (Southern House Spiders) - males look similar but have much longer pedipalps.
Life Cycle
Females produce 1-5 egg sacs containing about 50 eggs each. Spiderlings molt several times over a year to reach maturity. Adults can live for 2 to 4 years.
Ecological Importance
Provides significant natural pest control in homes and outbuildings by preying on silverfish, moths, and other nuisance insects.
Conservation Status
Not evaluated by IUCN; populations are stable and common in their native range.
Interesting Facts
Recluses are remarkably resilient and can survive for months without food or water. Unlike most spiders, they have a unique protein in their venom that is rare in the animal kingdom.
Photography Tips
Focus on the cephalothorax to capture the 'violin' mark. Macro shots of the eye arrangement (3 pairs) are the definitive way to confirm ID. Ensure lighting is sufficient to see the matte texture.
Identified: 2026-07-03T04:22:43.717478