Brown Recluse, Violin Spider, Fiddleback Spider
Loxosceles reclusa
Sicariidae (Six-Eyed Sand Spiders and Recluer Spiders), Order Araneae
Physical Description
A medium-sized spider with a distinctive cephalothorax that is relatively flat and an oval-shaped, finely haired abdomen. The most notable anatomical feature is the dark brown 'violin' or 'fiddle' shape on the dorsal side of the cephalothorax.
Size Estimate
Body length is typically 6-20 mm (1/4 to 3/4 inch). With legs extended, the span is roughly the size of a United States quarter.
Coloration & Markings
Uniformly tan to dark brown legs and abdomen with no banding or mottling. The cephalothorax features a dark, violin-shaped marking with the 'neck' of the fiddle pointing toward the abdomen.
Web Type
Irregular, sticky, grayish-white retreat webs. These are not used for catching prey but serve as a daylight hiding spot in undisturbed corners, closets, or basements.
Eye Arrangement
Uniquely arranged in three pairs (dyads) for a total of six eyes, rather than the eight common in most spiders. One pair is anterior-median, and two pairs are lateral.
Leg Characteristics
Long, slender, and uniformly colored legs. They lack thick spines but are covered in fine hairs. When at rest, the legs are often sprawled out radially.
Venom & Safety Information
Venom Information
Contains sphingomyelinase D, a cytotoxic (tissue-destroying) protein. It causes necrosis (local cell death) and, in very rare cases, systemic reactions (loxoscelism).
Medical Significance
Medically significant. Most bites result in minor redness, but some develop into a necrotic ulcer. Seek medical attention if a 'bullseye' lesion or systemic symptoms (fever, chills) appear.
Safety Recommendations
Avoid reaches into dark corners with bare hands. Shake out boots and clothing left on the floor. Use glue traps for monitoring and seal cracks/crevices in the home.
Habitat & Behavior
Habitat & Range
Primarily the Central and Southern United States. They prefer dark, dry, undisturbed areas such as woodpiles, sheds, basements, attics, and behind furniture.
Behavior & Temperament
Reclusive and nocturnal hunters. They are not aggressive and typically flee from light or movement. Bites most often occur when the spider is pressed against skin inside clothing or bedding.
Diet & Prey
Scavengers and active hunters that eat soft-bodied insects like crickets, cockroaches, and silverfish. They subdue prey with potent venom rather than webbing.
Seasonal Activity
Populations peak in the summer months (June and July) during mating season, which is when they are most likely to wander into living spaces.
Description
The Brown Recluse is one of the most misunderstood spiders in North America. While its necrotic venom is legendary, it is a shy creature that avoids human interaction. It is a master of hiding in the 'liminal' spaces of human homes, acting as a natural pest controller for household insects.
Key Features
The dark brown 'fiddle' marking on the head and the specific arrangement of six eyes in three pairs are the primary diagnostic features.
Similar Species
Often confused with Tegenaria (Hobo spiders) or Kukulcania (Southern House Spiders). Distinguish by the lack of leg bands and the presence of only six eyes.
Life Cycle
Females produce 1-5 egg sacs containing about 50 eggs each. They can live for 1 to 2 years in the wild and longer in laboratory settings. They are known for extreme resilience to food and water scarcity.
Ecological Importance
They serve as a significant predator of indoor pests like cockroaches and silverfish, helping to balance the indoor micro-ecosystem.
Conservation Status
Not listed by the IUCN; they are abundant and synanthropic (thriving in human-disturbed habitats).
Interesting Facts
Unlike many spiders, Brown Recluses can survive for over six months without food or water. They also do not use silk to capture prey, preferring to hunt on foot at night.
Photography Tips
Focus on the top of the cephalothorax to capture the violin marking. If possible, a macro shot of the eyes (showing the three pairs) is the only way to confirm id with 100% certainty.
Identified: 2026-05-22T15:58:11.663199