Brown Recluse, Violin Spider, Fiddle-back Spider
Loxosceles reclusa
Sicariidae (Six-eyed Sicariid Spiders), Order Araneae
Physical Description
A medium-sized spider with a distinctive flat, pear-shaped cephalothorax and an oval, uniform abdomen. The abdomen is covered in fine, short hairs giving it a velvety appearance without any mottling or spots. This specimen appears to be an adult male, evidenced by the large, bulbous pedipalps at the front.
Size Estimate
Body length typically ranges from 6 to 20 mm (1/4 to 3/4 inch). With legs extended, they are approximately the size of a U.S. quarter to a half-dollar.
Coloration & Markings
Light to medium brown base color. The most diagnostic marking is a dark, violin-shaped (fiddle-like) pattern on the top of the cephalothorax, with the neck of the violin pointing toward the abdomen. The legs and abdomen are a solid, uniform color with no stripes, bands, or spots.
Web Type
Builds irregular, off-white to grayish, sticky, disorganized retreat webs in dark, undisturbed areas. They do not use webs to snare prey actively like orb-weavers, but rather as a home base.
Eye Arrangement
Unique among most spiders in having only six eyes (most have eight) arranged in three pairs (dyads) in a semi-circle on the front of the head.
Leg Characteristics
Long, slender legs that are uniformly colored with no banding or prominent spines. The legs are covered in very fine hairs that may give them a slightly darker appearance than the body.
Venom & Safety Information
Venom Information
Contains sphingomyelinase D, a potent cytotoxin that can cause necrosis (tissue death) and breakdown of cell membranes. The venom is medically significant but systemically toxic effects are rare.
Medical Significance
Moderate to severe medical significance. Bites can cause a 'bullseye' lesion, localized pain, and in some cases, necrotic skin ulcers. Severe systemic reactions (loxoscelism) are rare but include fever and chills. Seek medical attention if a bite is suspected.
Safety Recommendations
Shake out clothing and shoes stored in dark areas before wearing. Use gloves when moving boxes or woodpiles. To relocate, use the cup-and-paper method carefully or seek professional pest management for heavy infestations.
Habitat & Behavior
Habitat & Range
Primarily found in the Central and Southeastern United States (the 'Recluse Belt'). They prefer dark, dry, undisturbed locations such as basements, attics, woodpiles, cardboard boxes, and behind furniture.
Behavior & Temperament
Generally reclusive and non-aggressive. They are nocturnal hunters that roam for prey at night. They typically only bite when pressed against skin, such as when trapped in clothing, shoes, or bedding.
Diet & Prey
Primarily hunts small insects and other spiders. They are known for scavenging dead insects as well as active hunting.
Seasonal Activity
Active year-round indoors, but sightings peak during the spring and summer mating seasons when males wander in search of females.
Description
The Brown Recluse is one of the most misunderstood and feared spiders in North America. Characterized by its signature 'violin' marking, it plays a quiet role as a nocturnal predator. Despite its reputation, it avoids human interaction whenever possible, preferring the dusty shadows of storage areas and crawlspaces.
Key Features
Dark violin-shaped marking on cephalothorax; six eyes in three pairs; sandy-brown uniform abdomen without patterns; long legs without spines.
Similar Species
Often confused with Wolf Spiders (Lycosidae), House Spiders (Tegenaria), or Cellar Spiders (Pholcidae). Distinguish by the specific 6-eye pattern and lack of leg spines or abdominal mottling.
Life Cycle
Females lay 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, sometimes longer in laboratory settings.
Ecological Importance
Acts as a natural pest control agent by consuming silverfish, cockroaches, and various other household insects and arthropods.
Conservation Status
Not evaluated (NE). Generally stable and common within its native geographic range.
Interesting Facts
They can survive for several months without food or water. Despite being widespread in some homes, documented bite cases remain relatively low compared to the number of spiders present.
Photography Tips
Focus on the top of the cephalothorax to clearly capture the violin marking and the eye arrangement (3 pairs). Use a macro lens or high-resolution close-up for identification.
Identified: 2026-06-01T14:56:34.171072