Brown Recluse Spider, Violin Spider, Fiddleback
Loxosceles reclusa (likely or related Loxosceles species)
Sicariidae (Six-eyed Sicariid Spiders), Order Araneae
Physical Description
Compact, oval-shaped abdomen and a distinct violin-shaped marking on the dorsal cephalothorax. The body appears velvety due to fine, short hairs rather than spines.
Size Estimate
Body length approximately 6 to 20 millimeters with a leg span of about 20 to 30 millimeters.
Coloration & Markings
Uniform tan to dark brown coloration with a characteristic darker violin-shaped pattern on the cephalothorax pointing toward the rear.
Web Type
Irregular, sticky, loose-mesh retreat web typically constructed in dark, undisturbed places rather than a symmetrical orb web.
Eye Arrangement
Uniquely arranged in three pairs ( dyads) forming a semicircle on the anterior portion of the cephalothorax, totaling six eyes instead of the usual eight.
Leg Characteristics
Long, thin, uniformly colored legs without prominent banding, spines, or conspicuous hairs, held somewhat flat against surfaces.
Venom & Safety Information
Venom Information
Contains a potent necrotic venom containing sphingomyelinase D, which can cause localized tissue destruction and dermonecrosis.
Medical Significance
Medically significant. Bites can result in severe necrotic lesions, though many bites heal without complication or significant systemic effects.
Safety Recommendations
Wear gloves when moving stored items in dark areas, shake out shoes before wearing, and gently relocate individuals outdoors using a cup and card.
Habitat & Behavior
Habitat & Range
Found primarily in the central and southern United States, inhabiting dark, dry, sheltered microhabitats such as woodpiles, basements, closets, and attics.
Behavior & Temperament
Nocturnal hunter and reclusive by nature; flees from light and disturbance rather than displaying aggressive tendencies.
Diet & Prey
Predominantly feeds on small insects such as cockroaches, crickets, and silverfish, actively hunting them down near its retreat.
Seasonal Activity
Active year-round indoors, with peak outdoor foraging and mating occurring during the warm summer months.
Description
The brown recluse is a famously cautious spider known for its characteristic violin marking and nocturnal habits. While widely feared for its necrotic venom, it rarely bites unless pressed directly against human skin.
Key Features
Distinct violin-shaped cephalothorax marking, uniform brown legs without bands, and an arrangement of six eyes in three pairs.
Similar Species
Cellar spiders (Pholcidae), grass spiders (Agelenidae), and wolf spiders (Lycosidae), which typically have eight eyes, banded legs, or lack the violin mark.
Life Cycle
Females produce several white, silk egg sacs containing up to 50 eggs each during the warmer months. Spiderlings mature through multiple molts over a lifespan of 1 to 2 years.
Ecological Importance
Acts as an effective natural pest controller by regulating populations of indoor and outdoor nuisance insects.
Conservation Status
Not evaluated by the IUCN; abundant and secure throughout its native range.
Interesting Facts
Brown recluses can survive for months without food or water in extremely dry indoor environments.
Photography Tips
Use macro lenses with adequate lighting to capture the dorsal cephalothorax pattern and eye arrangement safely from a respectful distance.
Identified: 2026-10-19T16:51:31.102596