Brown Recluse, Violin Spider, Fiddleback Spider
Loxosceles reclusa
Sicariidae (Six-eyed Sicarid Spiders), Order Araneae
Physical Description
A medium-sized spider with a relatively flat cephalothorax and an oval, finely-haired abdomen. It has a distinctive violin-shaped mark on the cephalothorax. The legs are long and slender without thick spines.
Size Estimate
Body length typically ranges from 6 to 20 millimeters (1/4 to 3/4 inch), with a total leg span roughly the size of a U.S. quarter or half-dollar.
Coloration & Markings
Uniformly light tan to dark brown. The most diagnostic marking is a dark brown 'violin' or 'fiddle' shape on the neck of the cephalothorax, with the 'neck' of the violin pointing toward the abdomen.
Web Type
Irregular, sticky, grayish-white retreat webs. These are not used for catching prey but rather as a daytime hiding spot in dark, undisturbed areas.
Eye Arrangement
Unique arrangement of six eyes (semelparous) organized into three pairs (dyads) in a semi-circle: one median pair and two lateral pairs.
Leg Characteristics
The legs are long, thin, and lack conspicuous spines. They are covered in fine hairs (setae) and are typically held in a sprawled, flat position.
Venom & Safety Information
Venom Information
Contains a potent cytotoxic (tissue-destroying) protein called sphingomyelinase D. This can cause necrosis (cell death) at the bite site in some cases.
Medical Significance
Medically significant. Most bites are minor and heal without intervention, but some can result in necrotic skin lesions (loxoscelism). Systemic reactions are rare but serious. Seek medical attention if symptoms worsen.
Safety Recommendations
Shake out shoes and clothing stored in dark areas. Wear gloves when moving stored boxes or woodpiles. To relocate, use the 'cup and paper' method or sticky traps. Clean wounds immediately and apply ice if bitten.
Habitat & Behavior
Habitat & Range
Primarily found in the Central and Midwestern United States. They inhabit dark, dry, undisturbed areas such as woodpiles, sheds, basements, closets, and behind stored boxes.
Behavior & Temperament
Reclusive and non-aggressive. They are nocturnal hunters that wander at night to find prey. Bites usually occur only when the spider is pressed against skin, such as inside clothing or bedding.
Diet & Prey
Opportunistic hunters that feed on soft-bodied insects like silverfish, crickets, and cockroaches. They are also known to scavenge on dead insects.
Seasonal Activity
Activity peaks during the warmer months from spring through autumn. They are less active in winter but can remain active year-round in temperature-controlled buildings.
Description
An elusive and misunderstood arachnid, the Brown Recluse is a master of camouflage in the shadows of human dwellings. Characterized by its signature violin marking and distinct six-eye pattern, it plays a vital role as a nocturnal predator of household pests.
Key Features
Six eyes in three pairs; dark violin-shaped marking on the cephalothorax; uniformly colored legs without bands or thick spines.
Similar Species
Often confused with Kukulcania hibernalis (Southern House Spider), Tegenaria domestica (Barn Funnel Weaver), and various Wolf Spiders, which usually have eight eyes and thicker spines.
Life Cycle
Females produce 1-5 egg sacs containing 40-50 eggs each. Spiderlings reach maturity in about one year and can live for 1 to 2 years in the wild, or longer in laboratory settings.
Ecological Importance
Serves as an important biological control agent for indoor and outdoor household pests, helping to manage populations of insects that can damage property.
Conservation Status
Not listed on the IUCN Red List. They are considered common and stable within their native geographic range.
Interesting Facts
Brown Recluses are exceptionally resilient and can survive for several months without food or water. Despite their reputation, they are remarkably shy and spend most of their lives hidden from view.
Photography Tips
Focus macro shots on the dorsal cephalothorax to clearly show the violin mark and the three pairs of eyes for positive identification.
Identified: 2026-05-22T15:46:25.481949