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, unpatterned abdomen. The texture is finely covered in tiny hairs (setae), giving it a velvety appearance. It lacks thick spines on its legs.
Size Estimate
Body length 6-20 mm (0.24-0.79 inches); leg span often reaching the size of a U.S. quarter (approx. 25 mm). The specimen in the image appears to be an adult.
Coloration & Markings
Uniformly light to medium brown; the most diagnostic feature is a dark, violin-shaped (fiddle) marking on the cephalothorax, with the neck of the 'violin' pointing toward the abdomen. The abdomen itself has no spots or stripes.
Web Type
Builds irregular, loose, grayish-white 'tangle' webs. These are not used for catching prey but serve as retreats/lining for crevices in dark, undisturbed areas.
Eye Arrangement
Distinctive arrangement of six eyes organized into three pairs (dyads): one median pair and two lateral pairs forming a semi-circle. This differs from most spiders which have eight eyes.
Leg Characteristics
Long, slender, and uniformly colored. They lack distinct bands, stripes, or heavy spines. The legs are held at a somewhat flattened angle when at rest.
Venom & Safety Information
Venom Information
Contains a potent cytotoxic protein called sphingomyelinase D, which can cause skin necrosis (tissue death) and, in rare cases, systemic reactions (loxoscelism).
Medical Significance
Medically significant. Most bites result in minor redness, but some develop into necrotic ulcers. Seek medical attention if a bite is suspected, especially if a blister or 'bullseye' pattern forms.
Safety Recommendations
Shake out shoes and clothing stored in dark areas. Wear gloves when moving woodpiles or boxes. Use sticky traps for monitoring. For relocation, use a jar and stiff paper; do not handle with bare hands.
Habitat & Behavior
Habitat & Range
Endemic to the Central and Southeastern United States. Preferred habitats include dark, dry, undisturbed areas like woodpiles, sheds, basements, closets, and behind baseboards.
Behavior & Temperament
Reclusive and non-aggressive. They are nocturnal hunters that wander to find prey. Bites typically occur only when the spider is pressed against skin (e.g., inside clothing or bedding).
Diet & Prey
Feeds on a variety of small insects like silverfish, cockroaches, and crickets. They are active hunters that do not rely on webs to snare prey.
Seasonal Activity
Active year-round indoors, but most frequent encounters occur during the warmer months (March to October) when they wander in search of mates.
Description
The Brown Recluse is a modest-looking but medically significant spider known for its reclusive nature. It is easily misidentified but can be distinguished by its lack of patterns on the legs and abdomen and its unique three-pair eye arrangement.
Key Features
Dark violin-shaped mark on the cephalothorax, six eyes in three pairs, uniformly colored legs without spines, and a monochromatic abdomen.
Similar Species
Often confused with Wolf Spiders (Lycosidae), which have patterns and 8 eyes, or Cellar Spiders (Pholcidae), which have much longer, thinner legs and different eye clusters.
Life Cycle
Females produce 1-5 egg sacs over a lifetime, each containing 30-50 eggs. Spiderlings molt several times over a year to reach maturity. Adults live 1-2 years.
Ecological Importance
Acts as an effective predator of indoor pests like silverfish and moths, contributing to natural pest control in hidden domestic areas.
Conservation Status
Not listed on IUCN; populations are stable and common throughout their native range.
Interesting Facts
The Brown Recluse can survive for months without food or water. Despite their reputation, many people live in infested homes for years without ever being bitten.
Photography Tips
A clear macro shot of the 'violin' mark and a front-facing shot to count the three pairs of eyes are essential for a positive identification.
Identified: 2026-06-15T15:10:47.430339