Brown Recluse Spider, Fiddleback Spider, Violin Spider
Loxosceles reclusa (or similar Loxosceles species)
Sicariidae (Six-eyed Sicariid Spiders), Order Araneae. Key family characteristics include having six eyes arranged in three dyads and a tendency to inhabit dry, dark, secluded areas.
Physical Description
The spider has a compact body with a distinctly marked cephalothorax and an oval-shaped abdomen. The texture is velvety due to fine, short hairs, and it lacks prominent spines on its legs.
Size Estimate
Body length is approximately 6 to 20 mm, with a leg span reaching up to 20 to 25 mm. The specimen in the image appears small, possibly a juvenile or a smaller adult male.
Coloration & Markings
Characterized by a light brown to yellowish-tan cephalothorax featuring a darker violin-shaped marking with the neck pointing backward. The abdomen is uniformly colored, ranging from tan to dark brown without distinct patterns.
Web Type
Irregular, loose, sticky retreat webs spun in dark, undisturbed areas such as under furniture, in closets, or within woodpiles, used primarily as a shelter rather than an active trap.
Eye Arrangement
Uniquely possesses six eyes arranged in three distinct pairs (dyads) forming a semicircle on the front of the cephalothorax, differing from the typical eight-eyed pattern of most spiders.
Leg Characteristics
Long, thin, uniform legs of a light brown color lacking distinct banding or prominent spines. They are typically held flat or slightly spread out when resting.
Venom & Safety Information
Venom Information
Contains potent necrotic venom containing the enzyme sphingomyelinase D, which destroys cell membranes and can cause localized tissue destruction (dermonecrosis).
Medical Significance
Medically significant. Bites can result in severe localized lesions, tissue necrosis, and slow-healing ulcers. Systemic symptoms are rare but possible. Seek medical attention if a bite occurs or develops a blister/ulcer.
Safety Recommendations
Shake out shoes and clothing before getting dressed, wear gloves when moving stored items in dark areas, and seal cracks in home foundations to prevent entry.
Habitat & Behavior
Habitat & Range
Found primarily in the central and southern United States, preferring dry, sheltered environments such as attics, basements, closets, and garages indoors, or under rocks and bark outdoors.
Behavior & Temperament
Reclusive, nocturnal hunters that actively forage at night. They are non-aggressive and typically bite only when trapped against the skin, such as by clothing or bedding.
Diet & Prey
Feeds primarily on small insects like cockroaches, crickets, and other soft-bodied arthropods, which are subdued with venom after active stalking.
Seasonal Activity
Most active during the spring and summer months when searching for mates, though they remain active year-round in heated indoor environments.
Description
The Brown Recluse is a notable household spider recognized by its characteristic violin marking and reclusive habits. While widely feared for its necrotic venom, it is non-aggressive and prefers to avoid human contact entirely.
Key Features
The distinctive violin-shaped marking on the cephalothorax and the unique arrangement of six eyes in three pairs are the definitive diagnostic features of this species.
Similar Species
Often confused with cellar spiders (Pholcidae), male orb-weavers, or grass spiders. Cellar spiders have very long, thin legs and eight eyes, while grass spiders feature prominent spinnerets and striped markings.
Life Cycle
Females produce several silk egg sacs containing around 30 to 50 eggs during the warmer months. Spiderlings go through multiple molts over a lifespan that can exceed one to two years.
Ecological Importance
Acts as an effective natural pest control agent by keeping populations of household insects and other arthropods in check.
Conservation Status
Not evaluated by the IUCN, but populations are secure and widespread within their natural geographic range.
Interesting Facts
Brown recluse spiders can survive for months without food or water in extremely dry conditions and are remarkably resilient in indoor human environments.
Photography Tips
Use a macro lens with good side lighting to highlight the cephalothorax markings and eye arrangement while maintaining a safe distance from the specimen.
Identified: 2026-08-21T05:28:23.338970