Southern House Spider
Kukulcania hibernalis
Filistatidae (Crevice Weavers), Order Araneae. Characterized by long-lived females and highly dimorphic males.
Physical Description
A large, robust spider with a velvety texture. Females are typically charcoal gray to black with a bulbous abdomen. Males (likely the one pictured) are light brown or amber with a smaller, elongated abdomen and extremely long pedipalps.
Size Estimate
Female body: 13-19mm; Male body: 9-13mm. Leg span can reach up to 50mm (2 inches). This specimen looks to be an adult male based on the leg-to-body ratio.
Coloration & Markings
Females are soot-black or dark gray. Males are uniform tan, amber, or light brown. They lack distinct patterns like stripes, but have a dark patch on the cephalothorax where the eyes are clustered.
Web Type
Crevice weavers build a distinctive 'calamistrate' web: a messy, non-sticky hackle-band silk radiating from a central hole or crevice in wood, brick, or stone.
Eye Arrangement
All eight eyes are tightly clustered together on a small, dark, raised tubercle located at the front-center of the cephalothorax.
Leg Characteristics
Long and relatively thick. In males, the legs are exceptionally long compared to the body. They lack heavy spines but are covered in fine, velvety hairs.
Venom & Safety Information
Venom Information
Possess a mild venom used to subdue small insects. It is not considered toxic to humans or large pets.
Medical Significance
Medically insignificant. Bites are extremely rare as the spider is not aggressive and its fangs are small. A bite might cause minor localized swelling or redness, similar to a bee sting.
Safety Recommendations
No special safety measures are needed. If found indoors, they can be easily moved outside with a cup and paper. They do not pose a threat to children or pets.
Habitat & Behavior
Habitat & Range
Common across the Southern United States, from Florida to California, and throughout Central and South America. They prefer man-made structures, crevices, and eaves.
Behavior & Temperament
Very timid and reclusive. Males often wander in search of mates, frequently entering homes. They are often mistaken for Brown Recluse spiders but are completely harmless and sluggish when confronted.
Diet & Prey
Generalist predators feeding on various insects such as flies, beetles, and cockroaches. They use their specialized silk to entangle prey at the entrance of their retreats.
Seasonal Activity
Active year-round in warmer climates, but males are most commonly seen 'wandering' indoors during the autumn mating season.
Description
An iconic resident of southern homes and barns, the Southern House Spider is a misunderstood giant. While their size and the male's resemblance to the Brown Recluse can cause alarm, they are beneficial, docile predators that help manage indoor pest populations.
Key Features
Tightly clustered eyes on a single mound, long pedipalps in males, and a velvety, uniform brown/gray coloration. They lack the dark 'violin' shape of a recluse.
Similar Species
Brown Recluse (Loxosceles reclusa). Distinguish by eyes: Recluses have 6 eyes in 3 pairs; Kukulcania has 8 eyes in 1 cluster. Recluses also have smoother legs without the velvety hair.
Life Cycle
Females are exceptionally long-lived, sometimes reaching 8 years or more. They stay in their webs while males wander during the late summer and fall to find them. Females provide maternal care to spiderlings.
Ecological Importance
Highly effective at natural pest control, particularly in agricultural outbuildings and home exteriors, focusing on beetles and flies.
Conservation Status
Not evaluated by the IUCN; widespread and common in urban and suburban environments.
Interesting Facts
The silk of this family is unique; it is dry and 'fuzzy' rather than sticky, acting like Velcro to snag the legs of insects. Females have been known to live for nearly a decade.
Photography Tips
Focus on the 'eye mound' at the front of the head to confirm identification. Capturing the length of the pedipalps (the small 'arms' by the mouth) helps identify the sex.
Identified: 2026-05-11T16:27:13.070972