Brown Recluse Spider, Violin Spider, Fiddleback
Loxosceles reclusa (or closely related Loxosceles species)
Sicariidae (Six-eyed Sicariid Spiders), Order Araneae. Key family characteristics include having six eyes arranged in distinct dyads.
Physical Description
The spider has a compact body with a distinct violin-shaped marking on the dorsal cephalothorax, pointing toward the abdomen. The body is relatively uniform in color without striking patterns on the abdomen.
Size Estimate
Body length typically ranges from 6 to 20 millimeters, with a leg span around 20 to 30 millimeters. The specimen appears relatively small, potentially an adult male or a late-stage juvenile.
Coloration & Markings
Uniform yellowish-brown to dark brown coloration. The signature feature is the darker violin marking on the cephalothorax. Legs are uniformly colored without prominent bands or spines.
Web Type
Irregular, loose tangle webs constructed in dark, undisturbed areas rather than structured orb webs.
Eye Arrangement
Uniquely possesses six eyes arranged in three pairs (dyads): one pair anteriorly and two pairs laterally. This is a diagnostic trait for the Sicariidae family.
Leg Characteristics
Long, slender, spindly legs lacking strong spines or visible banding patterns, often held in a sprawling or slightly defensive posture.
Venom & Safety Information
Venom Information
Contains a potent dermonecrotic agent (sphingomyelinase D) which can cause localized tissue destruction, necrosis, and systemic symptoms in rare cases.
Medical Significance
Medically significant. Bites can result in necrotic lesions that take weeks to heal, though many bites cause only mild irritation or go unnoticed.
Safety Recommendations
Shake out shoes and clothing left on the floor, wear gloves when handling stored items, and carefully relocate spiders using a container if found indoors.
Habitat & Behavior
Habitat & Range
Native to the central and southern United States. Prefers dry, sheltered, undisturbed microhabitats such as woodpiles, basements, attics, closets, and behind furniture.
Behavior & Temperament
Nocturnal, reclusive, and non-aggressive. They typically flee when disturbed and only bite defensively when trapped against human skin.
Diet & Prey
Active nocturnal hunters targeting crawling insects such as cockroaches, crickets, and silverfish.
Seasonal Activity
Most active during spring and summer months, moving indoors during autumn as temperatures drop.
Description
A secretive, nocturnal hunter commonly known as the brown recluse. Recognized by its fiddle-shaped marking and unusual six-eye arrangement, it plays a role in controlling household insect populations but warrants caution due to its necrotic venom.
Key Features
Presence of a violin-shaped marking on the cephalothorax and exactly six eyes arranged in three dyads.
Similar Species
Cellar spiders (Pholcidae), funnel-web grass spiders (Agelenidae), and wolf spiders (Lycosidae), which lack the specific six-eye pattern and violin marking.
Life Cycle
Females produce several egg sacs containing dozens of eggs during the warmer months. Spiderlings mature slowly over a year and can survive long periods without food or water.
Ecological Importance
Acts as an effective predator of household and outdoor insect pests, helping to regulate local insect populations.
Conservation Status
Not evaluated by the IUCN, highly abundant and secure throughout its native range.
Interesting Facts
Brown recluses can survive for months without food or water and thrive in human-made structures alongside populations.
Photography Tips
Use macro lenses with adequate lighting to capture the dorsal violin marking and the six-eye arrangement safely from a distance.
Identified: 2026-07-31T22:12:25.305800