Brown Recluse Spider, Violin Spider, Fiddleback
Loxosceles reclusa
Sicariidae (Six-eyed Sicariid Spiders), Order Araneae. Key family characteristics include having only six eyes arranged in three dyads and venom containing sphingomyelinase D.
Physical Description
The brown recluse has a uniform light brown to yellowish-tan body with very little pattern. The most notable anatomical feature is a dark brown, violin-shaped marking on the dorsal cephalothorax, with the neck of the violin pointing backward.
Size Estimate
Body length typically ranges from 6 to 20 millimeters (0.24 to 0.79 inches), with a leg span around 20 to 30 millimeters. This specimen appears to be an adult or sub-adult.
Coloration & Markings
Uniformly yellowish-brown to dark brown body. Lacks the strong banding or multi-colored patterns found on many other spiders. The distinct dark violin marking on the cephalothorax and the absence of spines on the legs are diagnostic.
Web Type
Irregular, sticky retreat webs spun in dark, sheltered places rather than geometric orb webs. Used mainly as a daytime shelter rather than an active insect trap.
Eye Arrangement
Uniquely possesses six eyes arranged in three pairs (dyads) forming a semicircle on the front of the head: one pair in front and a pair on each side.
Leg Characteristics
Long, slender, uniform light brown legs without prominent spines, bands, or stripes. They are held somewhat flat and extended when at rest.
Venom & Safety Information
Venom Information
Contains a potent necrotic venom primarily composed of sphingomyelinase D, which destroys cell membranes and can cause localized tissue destruction.
Medical Significance
Medically significant. While many bites result in minor red marks, some develop into necrotic lesions that require professional medical attention and slow healing.
Safety Recommendations
Shake out shoes and clothing before dressing, wear gloves when moving stored items in dark spaces, and carefully relocate spiders using a jar and stiff paper if found indoors.
Habitat & Behavior
Habitat & Range
Found primarily in the Midwestern and Southern United States. Prefers dark, dry, undisturbed areas such as woodpiles, basements, attics, closets, and behind furniture.
Behavior & Temperament
Reclusive, nocturnal hunters. They are non-aggressive and typically bite only when trapped against the skin, such as inside clothing or shoes.
Diet & Prey
Feeds primarily on small insects like roaches, crickets, and other soft-bodied arthropods, actively hunting them down at night near their retreat.
Seasonal Activity
Most active during warmer spring and summer months, but indoor populations remain active year-round in heated buildings.
Description
The brown recluse is one of North America's most misunderstood spiders. Known for its secretive nature and the characteristic violin marking on its back, it plays a valuable role in controlling household insect populations while preferring to stay completely out of human sight.
Key Features
Six eyes arranged in three pairs, a distinct violin-shaped dorsal marking on the cephalothorax, and uniformly colored legs lacking stripes, bands, or prominent spines.
Similar Species
Cellar spiders (Pholcidae), male grass spiders, and wolf spiders are frequently mistaken for brown recluses. They can be distinguished by eye count, lack of the violin pattern, and presence of heavy spination or striping.
Life Cycle
Females produce several white or off-white silken egg sacs containing about 30 to 50 eggs each during the warmer months. Spiderlings molt multiple times and can live for 1 to 3 years.
Ecological Importance
Acts as an effective natural pest controller in homes and natural habitats, managing insect populations effectively.
Conservation Status
Not evaluated by the IUCN, highly resilient and widespread throughout its native range.
Interesting Facts
Brown recluses can survive for months without food or water, and their venom contains enzymes that help digest prey internally.
Photography Tips
Photograph from a safe distance using macro lenses, ensure clear lighting focusing on the eye pattern and cephalothorax markings, and avoid handling the spider for photos.
Identified: 2026-08-15T22:58:42.807682