Brown Recluse, Violin Spider, Fiddleback Spider
Loxosceles reclusa
Sicariidae (Six-eyed Sicariid Spiders), Order Araneae. Characterized by having six eyes in three pairs (dyads) and a flattened body structure.
Physical Description
A medium-sized spider with a distinctive flattened cephalothorax and an oval-shaped abdomen. The body is covered in fine, short hairs giving it a velvety appearance. It is notable for its lack of spines on the legs and the presence of a 'violin' mark.
Size Estimate
Body length is typically 6-20 mm (1/4 to 3/4 inch). The leg span usually reaches about 25-38 mm (1 to 1.5 inches). This specimen appears to be an adult.
Coloration & Markings
Predominantly light to medium brown. Most distinguishably, the cephalothorax features a dark, violin-shaped mark with the neck of the violin pointing toward the abdomen. The abdomen is uniform in color (tan to dark brown) without any spots or patterns.
Web Type
Irregular, sticky, grayish-white tangle webs. These are not used for prey capture but rather as a retreat/retreat base in dark, undisturbed areas like woodpiles, sheds, or basements.
Eye Arrangement
Uniquely arranged in three pairs (dyads) forming a semi-circle: one pair in the front and one pair on each side. Total of six eyes instead of the eight seen in most spiders.
Leg Characteristics
Long, slender legs that are uniformly colored with no banding or contrasting stripes. The legs are covered in fine hairs but lack the thick, prominent spines found on wolf spiders or grass spiders.
Venom & Safety Information
Venom Information
Contains a potent cytotoxic (tissue-destroying) protein called sphingomyelinase D. This can lead to necrotic skin lesions (loxoscelism) in some cases, though many bites result in minor symptoms.
Medical Significance
Medically significant. While rarely fatal, bites can cause systemic symptoms (fever, chills) or localized tissue death forming an ulcer. Immediate medical consultation is advised if a bite is suspected.
Safety Recommendations
Shake out shoes and clothing left on the floor. Wear gloves when moving boxes or wood. If you find one, use a cup and paper to relocate it outdoors, or use sticky traps for monitoring infestations.
Habitat & Behavior
Habitat & Range
Commonly found in the Central and Midwestern United States. They prefer dark, dry, undisturbed microhabitats such as behind baseboards, under porches, in attics, and inside cardboard boxes.
Behavior & Temperament
Reclusive and non-aggressive. They are nocturnal hunters that leave their webs at night to forage. Most bites occur when the spider is accidentally pressed against skin (e.g., inside clothing or bedding).
Diet & Prey
Primarily feeds on soft-bodied insects like cockroaches, crickets, and silverfish. They are active hunters that overpower prey rather than relying on a web for capture.
Seasonal Activity
Active year-round in temperature-controlled indoor environments, though sightings peak from spring through autumn as they become more active in search of mates and food.
Description
The Brown Recluse is one of the most misunderstood spiders in North America. Cloaked in a dull tan to brown, it avoids light and human activity, playing a vital role in controlling indoor insect populations. Its 'violin' mark is its hallmark identifier, though it requires close inspection to see clearly.
Key Features
Six eyes in three pairs; dark violin-shaped marking on the cephalothorax; uniformly colored abdomen; legs lack thick spines.
Similar Species
Often confused with Wolf Spiders (Lycosidae), which have eight eyes and thick leg spines, or Cellar Spiders (Pholcidae), which have much longer, thinner legs and different eye patterns.
Life Cycle
Females produce one to five egg sacs over their lifetime, each containing about 40-50 eggs. Spiderlings take about a year to mature. Adults can live between 1 to 2 years.
Ecological Importance
Acts as an important natural pest controller, especially for household pests like silverfish and moths, helping to maintain balance in the micro-ecosystems of human structures.
Conservation Status
Not listed by the IUCN. They are considered common and widespread in their native range, often thriving in anthropogenic (human-altered) environments.
Interesting Facts
Brown Recluses are remarkably resilient and can survive for months without food or water. They are also known to scavenge on dead insects, which is unusual for many predatory spiders.
Photography Tips
A macro shot focusing on the top of the cephalothorax is essential to capture the 'violin' mark and the six-eye arrangement for positive identification. Use a flashlight for better lighting in dark corners.
Identified: 2026-07-12T17:42:07.155988