Brown Recluse Spider (suspected based on clinical lesion presentation)
Loxosceles reclusa (or potentially other arthropod/spider envenomation)
Sicariidae (Six-eyed Sicariid Spiders), Order Araneae
Physical Description
The image provided does not display a spider, but rather a localized, erythematous, edematous skin reaction with a central punctum, typical of a necrotic arachnid bite or arthropod envenomation.
Size Estimate
N/A - the image shows a skin lesion approximately 4 to 6 centimeters in diameter.
Coloration & Markings
The skin lesion shows significant localized erythema (redness), swelling, and a central puncture site or early necrotic core.
Web Type
Irregular, sticky retreat webs built in dark, undisturbed areas, typical of reclusive spiders.
Eye Arrangement
Six eyes arranged in distinct dyads (pairs): one median pair and two lateral pairs, characteristic of the family Sicariidae.
Leg Characteristics
Long, thin, uniform brown legs lacking prominent spines or distinct banding patterns.
Venom & Safety Information
Venom Information
Contains sphingomyelinase D, a potent necrotic toxin that destroys cell membranes and causes localized tissue destruction.
Medical Significance
Medically significant. Can cause dermonecrotic lesions (necrotic arachnidism). Medical evaluation is recommended if the lesion expands, ulcerates, or if systemic symptoms develop.
Safety Recommendations
Keep tetanus vaccinations up to date, clean the wound with soap and water, apply cold compresses, elevate the area, and seek professional medical evaluation.
Habitat & Behavior
Habitat & Range
Central and southern United States, typically found in dark, dry, undisturbed locations such as woodpiles, basements, and closets.
Behavior & Temperament
Reclusive, nocturnal, and non-aggressive; bites typically occur only when the spider is trapped against human skin.
Diet & Prey
Various small insects captured by active hunting near its retreat.
Seasonal Activity
Most active during spring and summer months, though indoor specimens remain active year-round.
Description
The provided image depicts a significant localized inflammatory and potentially necrotic skin reaction resulting from a suspected spider bite or arthropod envenomation. While the spider itself is not visible, the clinical presentation warrants careful medical monitoring.
Key Features
Localized erythema, swelling, central punctum, and potential for central blistering or necrosis.
Similar Species
Wolf spiders, grass spiders, and cellar spiders, which are harmless but frequently mistaken for reclusive spiders.
Life Cycle
Produces multiple silken egg sacs containing several dozen eggs during the warmer months, maturing over a span of one to two years.
Ecological Importance
Acts as a natural population control agent for household insects and agricultural pests.
Conservation Status
Not evaluated by the IUCN; abundant and secure throughout its native range.
Interesting Facts
Reclusive spiders can survive for months without food or water in extremely dry environments.
Photography Tips
If photographing a suspected spider for identification, capture clear top-down views of the dorsal cephalothorax showing the eye pattern and violin marking without putting fingers at risk.
Identified: 2026-08-28T13:55:56.795421