Brown Recluse Spider, Fiddle-back Spider, Violin Spider, Recluse Spider
Loxosceles reclusa
Sicariidae (Six-eyed Sicariid Spiders), Order Araneae. Key family characteristics include having only six eyes arranged in distinct dyads.
Physical Description
The brown recluse has a uniform, velvety appearance due to fine, short hairs covering its body. It features an oval-shaped abdomen and a distinct violin-shaped marking on its cephalothorax, with the neck of the fiddle pointing backward.
Size Estimate
Body length typically ranges from 6 to 20 millimeters (about 0.25 to 0.75 inches), with a leg span up to 25 to 30 millimeters (1 inch). The specimen appears to be an adult or sub-adult.
Coloration & Markings
Colors range from yellowish-tan to dark brown. The defining marking is the dark violin shape on the dorsal cephalothorax. The abdomen is uniformly colored without stripes or complex patterns.
Web Type
Does not spin an orb web. Instead, it constructs a loose, irregular retreat web made of sticky, off-white silk, usually in dark, undisturbed areas.
Eye Arrangement
Uniquely possesses six eyes arranged in three pairs (dyads) separated from one another: a pair in front and a pair on each side, which is characteristic of the family Sicariidae.
Leg Characteristics
Long, thin, delicate legs of a uniform color lacking prominent spines, banding, or stripes. They are typically held in a spread-out, flat posture.
Venom & Safety Information
Venom Information
Contains a potent necrotic venom containing the enzyme sphingomyelinase D, which can destroy cell membranes and cause localized tissue destruction.
Medical Significance
Medically significant. While many bites result in mild local irritation, some can cause necrotic skin lesions (dermonecrosis) that require medical evaluation. Systemic reactions are rare.
Safety Recommendations
Shake out shoes and clothing left on the floor, wear gloves when moving stored items, seal cracks in walls, and gently relocate spiders outdoors using a cup and card if found inside.
Habitat & Behavior
Habitat & Range
Found primarily in the central and southern United States. Prefers warm, dry, undisturbed microhabitats such as woodpiles, basements, attics, closets, and behind furniture.
Behavior & Temperament
Reclusive, nocturnal hunter. It is non-aggressive and will flee when disturbed, only biting when trapped against human skin (such as inside clothing or shoes).
Diet & Prey
Feeds primarily on small insects such as cockroaches, crickets, and other soft-bodied arthropods, actively hunting them down near its retreat.
Seasonal Activity
Most active during spring and summer months when they forage for food, often seeking indoor shelter as temperatures drop in autumn.
Description
The Brown Recluse is a modest yet infamous inhabitant of dark corners and crevices in homes across its range. Easily identified by its distinct violin-shaped marking and unusual six-eye arrangement, it plays a quiet role in controlling household insect populations despite its intimidating reputation for necrotic venom.
Key Features
Distinct violin marking on the cephalothorax, uniform brown legs without bands, lack of abdominal patterns, and six eyes arranged in three dyads.
Similar Species
Cellar spiders (Pholcidae), grass spiders (Agelenidae), and male southern house spiders (Kukulcania hibernalis). Distinguished by examining eye counts and the lack of the violin pattern.
Life Cycle
Females produce several silken egg sacs containing about 30 to 50 eggs during the warmer months. Spiderlings molt multiple times before reaching maturity, with a potential lifespan of 1 to 3 years.
Ecological Importance
Acts as an effective predator of household insect pests, helping to regulate populations of roaches, silverfish, and crickets.
Conservation Status
Not evaluated by the IUCN, but populations are secure and widespread within their natural geographic range.
Interesting Facts
Brown recluses can survive for months without food or water. Their scientific name, reclusa, means solitary, reflecting their reclusive nature.
Photography Tips
Use a macro lens in well-lit conditions or with a diffuser. Focus on capturing the dorsal view of the cephalothorax to clearly show the violin marking and eye arrangement safely from a distance.
User Notes
In the sink
Identified: 2026-08-05T04:10:17.239919