Brown Recluse, Fiddleback Spider, Violin Spider
Loxosceles reclusa
Sicariidae (Six-eyed Sand Spiders and Recluses), Order Araneae. Characterized by having six eyes and a distinct necrotoxic venom.
Physical Description
A medium-sized spider with a relatively flat cephalothorax and an oval-shaped abdomen. The body is covered in fine, short hairs rather than long spines. It has a distinct violin-shaped mark on the cephalothorax.
Size Estimate
Body length is typically 6-12 mm (0.24-0.47 in). With legs extended, they are approximately the size of a United States quarter.
Coloration & Markings
Uniform tan to dark brown coloration on the abdomen and legs with no banding or mottling. The most distinctive feature is a dark brown violin-shaped marking on the carapace, with the 'neck' of the violin pointing toward the abdomen.
Web Type
Builds irregular, asymmetric, and messy-looking retreat webs of whitish or grayish silk. Webs are typically built in dark, undisturbed areas and are not used for catching prey actively.
Eye Arrangement
Uniquely, this species has six eyes arranged in three pairs (dyads) in a semi-circle: one median pair and two lateral pairs. This is a primary diagnostic feature.
Leg Characteristics
The legs are long, slender, and monochromatic (no stripes or spots). They are covered in very fine hairs but lack the prominent thick spines found on many other common spiders.
Venom & Safety Information
Venom Information
Potent necrotoxic venom containing the enzyme sphingomyelinase D. This enzyme causes cell membrane destruction and can lead to localized tissue death (necrosis).
Medical Significance
Medically significant. While most bites result in a small red mark that heals without intervention, a small percentage develop into necrotic lesions. Systemic reactions are rare but can include fever and chills.
Safety Recommendations
Shake out shoes and clothing stored in dark areas. Wear gloves when moving wood or boxes. If bitten, clean the area, apply ice, and seek medical attention if a lesion or systemic symptoms develop.
Habitat & Behavior
Habitat & Range
Primarily found in the Central and Southeastern United States (the 'Recluse Belt'). Prefers dark, dry, undisturbed environments like woodpiles, sheds, basements, attics, and behind furniture.
Behavior & Temperament
Reclusive and non-aggressive. They are nocturnal hunters that prefer to flee rather than bite. Most bites occur when the spider is accidentally pressed against skin (e.g., inside clothing or bedding).
Diet & Prey
Scavengers and active hunters. They feed on a variety of soft-bodied insects like crickets, cockroaches, and silverfish. They can survive for long periods (months) without food or water.
Seasonal Activity
Most active from March through October. During winter, they remain dormant in cracks and crevices within climate-controlled environments.
Description
The Brown Recluse is a shy, often misunderstood arachnid that plays a vital role in controlling indoor pest populations. Despite its fearsome reputation, it is a reclusive animal that avoids human contact whenever possible.
Key Features
Uniformly colored legs (no bands), six eyes in three pairs, and the dark violin-shaped mark on the cephalothorax.
Similar Species
Often confused with Wolf Spiders (which have 8 eyes and patterns on the abdomen), Cellar Spiders (which have much thinner legs), and Kukulcania hibernalis (Metaltella simoni).
Life Cycle
Females produce 1-5 egg sacs containing about 50 eggs each. Spiderlings reach maturity in about a year and adults can live for 1 to 2 years. They are known for their extreme hardiness.
Ecological Importance
Act as a natural form of pest control within human structures, preying on disease-carrying insects like cockroaches and flies.
Conservation Status
Not listed. Populations are stable and they are often considered synanthropic, meaning they thrive in human-altered environments.
Interesting Facts
Despite their name, Brown Recluses can live in very high densities inside a single home without the residents ever seeing one or being bitten.
Photography Tips
A macro shot focusing on the top of the 'head' (cephalothorax) to show the eye arrangement and violin mark is the most important for expert identification.
Identified: 2026-05-04T23:00:10.016618