Brown Recluse Spider, Fiddleback Spider, Violin Spider
Loxosceles reclusa
Sicariidae (Six-eyed Sicariid Spiders), Order Araneae. Key family characteristics include the presence of only six eyes arranged in distinct pairs and the tendency to build irregular sheet webs.
Physical Description
The specimen appears to be a deceased or molted brown recluse spider. It features a somewhat flattened, light brown to yellowish-brown cephalothorax (often showing a faint violin-shaped marking when viewed from above) and a slightly darker, uniformly colored oval abdomen covered in fine, short hairs.
Size Estimate
Body length is estimated to be around 8 to 10 millimetres, with a leg span of approximately 20 to 25 millimetres, consistent with an adult or near-adult specimen of this species.
Coloration & Markings
Uniformly light brown to tan body with very little pattern. The cephalothorax features a characteristic darker violin shape pointing toward the rear, though this can sometimes be faint or difficult to see clearly depending on the specimen and lighting.
Web Type
Does not build an orb web; creates an irregular, sticky, disorganized retreat web usually hidden in dark, undisturbed places such as crevices, under rocks, or behind furniture.
Eye Arrangement
Features six eyes arranged in three dyads (pairs): one median pair and two lateral pairs, which is a key diagnostic feature for the family Sicariidae.
Leg Characteristics
Long, thin, delicate legs of a uniform brown color without distinct banding or prominent spines, often held in a sprawling or slightly curled posture in death.
Venom & Safety Information
Venom Information
Contains a potent necrotic venom primarily composed of the enzyme sphingomyelinase D, which destroys cell membranes and can cause localized tissue destruction around the bite site.
Medical Significance
Medically significant. While many bites result in mild, self-limiting reactions, some can cause necrotic skin lesions (dermonecrosis) that require medical evaluation and proper wound care.
Safety Recommendations
Shake out shoes and clothing left on the floor before wearing, wear gloves when moving stored items in dark areas, and safely relocate any found spiders using a container and a piece of card.
Habitat & Behavior
Habitat & Range
Found primarily in the central and southern United States, inhabiting dry, warm, undisturbed areas both outdoors under bark and rocks and indoors in dark corners, closets, and attics.
Behavior & Temperament
Reclusive, nocturnal hunters that avoid light and human contact. They are not aggressive and typically only bite when trapped against the skin, such as inside clothing or shoes.
Diet & Prey
Feeds primarily on small insects such as cockroaches, crickets, and other soft-bodied arthropods, actively hunting them 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 North America's most misunderstood and recognized spiders. Famed for its violin-shaped marking and secretive habits, it prefers to stay hidden away from human activity, playing an important role in controlling indoor and outdoor insect populations.
Key Features
Six eyes arranged in three pairs, a uniform brown abdomen without stripes or patterns, and a characteristic darker violin-shaped marking on the dorsal cephalothorax.
Similar Species
Cellar spiders (Pholcidae), male southern house spiders (Kukulcania hibernalis), and grass spiders (Agelenidae), which can be distinguished by examining eye patterns, leg spination, and abdominal markings.
Life Cycle
Females produce several white, papery egg sacs containing around 30 to 50 eggs each during the warmer months. Spiderlings molt several times before reaching maturity, with a total lifespan typically ranging from 1 to 3 years.
Ecological Importance
Acts as an effective natural pest controller by preying on common household and agricultural insect pests, helping to regulate local arthropod populations.
Conservation Status
Not evaluated by the IUCN, but populations are generally stable and widespread throughout their native range.
Interesting Facts
Brown recluse spiders can survive for months without food or water in extreme conditions. Despite their fearsome reputation, they are reluctant biters and prefer to flee when disturbed.
Photography Tips
Use macro lenses with adequate natural or diffused lighting to capture fine details such as the eye arrangement and cephalothorax markings without damaging or unnecessarily handling the specimen.
Identified: 2026-09-02T00:36:50.936349