Brown Recluse Spider, Violin Spider, Fiddleback Spider
Loxosceles reclusa
Sicariidae (Six-Eyed Sicariid Spiders), Order Araneae. Key family characteristics include the unique arrangement of six eyes in three dyads and typically nocturnal, wandering habits.
Physical Description
The brown recluse has a distinctively uniform body structure featuring a violin-shaped marking on its cephalothorax, pointing toward the abdomen. The body is finely covered with short, delicate hairs rather than being heavily spiny. The abdomen is oval, uniformly colored without striking patterns, and the texture is soft and velvety.
Size Estimate
Body length typically ranges from 6 to 20 millimeters (0.24 to 0.79 inches), with a leg span reaching up to 25 to 50 millimeters (1 to 2 inches). The specimen shown appears to be an adult of moderate size.
Coloration & Markings
Coloration ranges from light tan to dark brown. The defining marking is the dark brown violin shape on the dorsal side of the cephalothorax (the 'fiddle' pattern). The legs and abdomen are generally a solid, uniform brown without distinct bands, stripes, or patterns.
Web Type
Does not build an orb or traditional capturing web. Instead, it constructs erratic, off-center retreat webs or sheet-like retreats in dark, secluded areas used primarily for shelter during the day.
Eye Arrangement
Uniquely possesses only six eyes (most spiders have eight), arranged in three distinct pairs (dyads): one pair centrally located in front and two lateral pairs on either side.
Leg Characteristics
Legs are long, slender, and uniformly colored without spines or visible banding patterns. They are held somewhat flat and spread out when resting or running.
Venom & Safety Information
Venom Information
Possesses a potent necrotic venom containing the enzyme sphingomyelinase D, which destroys cell membranes and can cause localized tissue destruction (dermonecrosis).
Medical Significance
Medically significant. While many bites result in minor localized irritation, severe envenomation can cause deep necrotic ulcers, scarring, and systemic symptoms (loxoscelism). Prompt medical evaluation is recommended for suspected bites.
Safety Recommendations
Wear gloves when moving stored items in dark areas, shake out shoes before wearing, seal cracks in homes, and carefully relocate unwanted indoor specimens using a container and piece of paper.
Habitat & Behavior
Habitat & Range
Native to the central and southern United States, ranging from Midwest states down to Texas and eastward to Georgia. Prefers dark, dry, undisturbed microhabitats such as woodpiles, basements, closets, attics, and behind furniture.
Behavior & Temperament
A nocturnal, wandering hunter that is timid and non-aggressive, preferring to retreat or hide rather than bite when disturbed. Bites typically occur only when the spider is trapped against human skin.
Diet & Prey
Feeds primarily on small insects such as cockroaches, crickets, and silverfish, using its active hunting tactics and venom to subdue prey within its retreat.
Seasonal Activity
Most active during the warmer spring and summer months, though indoor specimens remain active year-round due to climate-controlled environments.
Description
The brown recluse is a reclusive indoor and outdoor dweller widely recognized by its signature violin marking. Though famous for its medically significant bite, it plays a beneficial role in controlling household pest populations and actively avoids human contact.
Key Features
Uniformly light brown to tan color, a dark violin-shaped marking on the cephalothorax, six eyes arranged in three pairs, and the absence of any visible bands or spines on the long legs.
Similar Species
Often confused with cellar spiders (Pholcidae), grass spiders (Agelenidae), and male hobo spiders (Tegenaria agrestis), all of which typically have eight eyes, patterned abdomens, and lack the violin cephalothorax marking.
Life Cycle
Females produce several silk egg sacs containing around 30 to 50 eggs during the warmer months. Spiderlings hatch, molt multiple times over a year or two, and can live for several years in optimal conditions.
Ecological Importance
Acts as an effective apex predator of household and garden insect pests, helping naturally regulate local populations of roaches and other crawling insects.
Conservation Status
Not evaluated by the IUCN, but highly abundant and secure throughout its native geographic range.
Interesting Facts
Brown recluses can survive for months without food or water, and their scientific name 'reclusa' translates to secluded, perfectly describing their retiring nature.
Photography Tips
Photograph from a safe distance using macro lenses, ensure bright and even lighting to capture the diagnostic eye arrangement and cephalothorax violin pattern clearly without disturbing the spider.
Identified: 2026-08-26T16:45:57.303999