Brown Recluse Spider, Violin Spider, Fiddleback 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 microscopic hairs. It features a distinct fiddle-shaped or violin-shaped marking on the dorsal cephalothorax, with the neck of the fiddle pointing backward. The abdomen is oval, uniformly colored without prominent patterns, and ranges from tan to dark brown.
Size Estimate
Body length is typically 6 to 20 millimeters (0.24 to 0.79 inches), with a leg span ranging from 20 to 30 millimeters (0.79 to 1.18 inches). The specimen shown appears to be a typical adult or sub-adult.
Coloration & Markings
Coloration ranges from light tan to dark brown. The defining marking is the dark violin-shaped pattern on the cephalothorax. Legs are long, thin, and uniformly colored without distinct banding, stripes, or spines.
Web Type
They do not build traditional orb webs for catching prey. Instead, they spin irregular, loose, sticky retreats or webs in dark, undisturbed areas, which are used primarily as shelter during the day.
Eye Arrangement
Unlike most spiders that have eight eyes, the brown recluse has six eyes arranged in three pairs (dyads): one pair at the front and a pair on each side. This is a critical diagnostic feature for the Sicariidae family.
Leg Characteristics
Legs are long, slender, and delicate, lacking prominent spines or distinct color banding. When resting, they are often held outstretched in a sprawling posture.
Venom & Safety Information
Venom Information
Contains a potent cytotoxic venom containing the enzyme sphingomyelinase D, which destroys cell membranes and can cause local tissue necrosis (dermonecrotic lesion).
Medical Significance
Medically significant. While many bites result in mild, localized reactions, some can develop into necrotic ulcers requiring medical attention. Systemic symptoms are rare but possible.
Safety Recommendations
Shake out shoes and clothing left on the floor, wear gloves when moving stored items in dark areas, and seal cracks in homes. If bitten, clean the area and seek medical evaluation.
Habitat & Behavior
Habitat & Range
Native to the central and southern United States, ranging from the Midwest down to Texas and eastward to Georgia. They prefer dark, dry, undisturbed microhabitats such as woodpiles, basements, attics, closets, and behind furniture.
Behavior & Temperament
Reclusive and nocturnal hunters. They actively forage for prey at night and flee from light or disturbance rather than acting aggressively. Bites usually occur only when trapped against human skin.
Diet & Prey
Primarily carnivorous, feeding on small insects such as cockroaches, crickets, and silverfish, which they hunt actively or ambush near their retreat.
Seasonal Activity
Most active during the warmer spring and summer months, though they can remain active year-round indoors in climate-controlled buildings.
Description
The brown recluse is one of the most widely recognized and misunderstood spiders in North America. Known for its characteristic violin marking and nocturnal habits, it plays a vital ecological role in controlling household and outdoor insect populations while preferring to stay completely out of human sight.
Key Features
Six eyes arranged in three pairs, a distinct violin-shaped marking on the cephalothorax pointing toward the abdomen, and uniformly colored, unbanded legs.
Similar Species
Cellar spiders (Pholcidae), grass spiders (Agelenidae), and wolf spiders (Lycosidae) are often mistaken for brown recluses. These can be distinguished by having eight eyes, patterned abdomens, spiny legs, or lack of the violin marking.
Life Cycle
Females produce several egg sacs containing around 50 eggs each during the warm months. Spiderlings go through multiple molts before reaching maturity. Lifespan can be up to 1 to 2 years.
Ecological Importance
Acts as an effective natural predator, helping to regulate populations of nuisance insects and other small arthropods in both natural and domestic environments.
Conservation Status
Not evaluated by the IUCN, but populations are generally stable and abundant within their native geographic range.
Interesting Facts
Brown recluses can survive for months without food or water. Despite their fearsome reputation, they are remarkably docile and will typically run away when disturbed.
Photography Tips
Use a macro lens in a safe, controlled setting (such as inside a clear container). Focus sharply on the dorsal view of the cephalothorax to clearly capture the violin pattern and eye arrangement.
Identified: 2026-09-22T17:33:51.688399