Arizona Recluse
Loxosceles arizonica
Sicariidae (Six-eyed Sicariid Spiders), Order Araneae. Key family characteristics include having only six eyes arranged in three dyads and a distinct violin-shaped marking on the carapace.
Physical Description
The Arizona Recluse is a moderately proportioned spider with a flattened cephalothorax and an oblong, velvety abdomen. It has slender, delicate legs and lacks prominent spines, instead featuring fine, short hairs. The cephalothorax often displays the classic violin pattern characteristic of the genus.
Size Estimate
Body length typically ranges from 7 to 12 mm, with a leg span of approximately 20 to 30 mm. This specimen appears to be an adult.
Coloration & Markings
Base coloration ranges from yellowish-tan to dark brown. The cephalothorax features a darker violin-shaped marking with the neck pointing toward the rear. The abdomen is uniformly colored without distinct bands or patterns, usually matching the carapace or slightly lighter.
Web Type
Does not build a traditional orb or sheet web. Instead, it constructs a loose, irregular, sticky retreat of silk used primarily for shelter during the day in dark, undisturbed crevices.
Eye Arrangement
Uniquely possesses six eyes arranged in three pairs (dyads): one pair at the front center and a pair on each side, which is a key diagnostic feature for the Sicariidae family.
Leg Characteristics
Long, slender, and uniformly colored without distinct banding or stripes. The legs are held flat against the surface or spread outward when resting, lacking prominent spines but covered in fine setae.
Venom & Safety Information
Venom Information
Contains a potent necrotic venom featuring the active enzyme sphingomyelinase D, which destroys cell membranes and can cause localized tissue breakdown.
Medical Significance
Medically significant. A bite can cause a necrotic skin lesion (loxoscelism), resulting in a painful sore that may ulcerate and take weeks to heal. Systemic reactions are rare but possible.
Safety Recommendations
Shake out shoes and clothing before getting dressed, wear gloves when moving stored items in garages or sheds, and gently relocate spiders outdoors using a container if found in living spaces.
Habitat & Behavior
Habitat & Range
Endemic to the southwestern United States, specifically abundant in the Sonoran Desert regions of Arizona including the Phoenix metropolitan area, Gilbert, and Mesa. Prefers arid environments, hiding under rocks, bark, and in human dwellings in dark, dry areas.
Behavior & Temperament
Nocturnal and reclusive, actively foraging at night. Generally non-aggressive, fleeing from disturbances rather than attacking, though they will bite if trapped against human skin.
Diet & Prey
Predominantly carnivorous, feeding on various small insects such as cockroaches, crickets, and silverfish by actively hunting or ambushing them near its retreat.
Seasonal Activity
Most active during the warm spring, summer, and early autumn months. During winter, they seek shelter indoors or deep within natural crevices to brumate.
Description
The Arizona Recluse is a subtle yet medically important inhabitant of the American Southwest. Blending seamlessly into arid landscapes and domestic crevices, this nocturnal hunter plays a vital role in controlling household and desert pest populations while demanding respect and caution from human co-inhabitants.
Key Features
Six eyes in three pairs, a distinct violin marking on the dorsal cephalothorax, uniform brown legs lacking bands, and a smooth, unpatterned abdomen.
Similar Species
Cellar spiders (Pholcidae) have much longer legs and eight eyes; funnel-web grass weavers have distinct patterns and spines; other Loxosceles species look nearly identical and require microscopic examination of genitalia to differentiate.
Life Cycle
Females produce several white silk egg sacs containing dozens of eggs during the warmer months. Spiderlings molt multiple times as they grow, reaching maturity in about a year. Lifespan can exceed two years.
Ecological Importance
Acts as an effective apex predator of small insects and arthropods in both desert ecosystems and domestic environments, helping to naturally manage pest populations.
Conservation Status
Not evaluated by the IUCN, but populations are stable and abundant within their native desert and urban-edge habitats.
Interesting Facts
Recluse spiders can survive for months without food or water in extremely dry conditions. Their venom contains enzymes that specifically target mammalian tissue proteins.
Photography Tips
Photograph from a safe distance using a macro lens. Capture the dorsal view to clearly show the eye arrangement, violin pattern, and lack of leg banding.
User Notes
found in arizona, edge of gilbert to mesa
Identified: 2026-09-18T22:59:43.980673