Southern House Spider
Kukulcania hibernalis
Filistatidae (Crevice Weavers), Order Araneae
Physical Description
Velvety texture with a bulbous, oval abdomen and a smaller cephalothorax. The females are robust and dark, while males have much longer legs and a thinner body, often confused with brown recluses. This specimen appears to be a female or a large juvenile.
Size Estimate
Body length 13–19 mm for females; leg span can reach 2 inches. This specimen appears to be an adult female based on the dark, robust abdomen.
Coloration & Markings
Deep charcoal grey to blackish-brown. The abdomen often has a slightly lighter, mottled pattern of dark spots. The cephalothorax is typically darker than the abdomen.
Web Type
Hackled-silk crevice web. It is a non-sticky, woolly silk that radiates out from a central retreat (hole or crack). The silk is bluish-white when fresh and becomes 'messy' over time.
Eye Arrangement
A tight cluster of eight eyes located on a small, raised tubercle on the front of the cephalothorax. This 'clumped' eye pattern is diagnostic of Filistatidae.
Leg Characteristics
The legs are sturdy, finely hairy (pubescent), and the first pair of legs is notably longer. They lack the distinct spines found on wolf spiders.
Venom & Safety Information
Venom Information
The venom is not considered medically significant to humans. It is designed to immobilize small insects and has very low toxicity to mammals.
Medical Significance
Harmless. Bites are very rare due to their shy nature and small fangs which struggle to penetrate human skin. Symptoms are usually less severe than a bee sting, involving minor localized swelling.
Safety Recommendations
No special safety measures required. If webs are unsightly, they can be removed with a broom. To relocate, use a cup and paper as they are very fast but not dangerous.
Habitat & Behavior
Habitat & Range
Common throughout the Southern United States, Central, and South America. They prefer man-made structures, residing in crevices of brick walls, window frames, and under eaves.
Behavior & Temperament
Extremely timid and sedentary. They rarely leave their web-lined retreat except to grab prey that vibrates the silk. They often 'peek' out of their hole, as noted in the user description.
Diet & Prey
Insects like beetles, flies, and cockroaches. They use their unique calimitrum (specialized leg hairs) to comb out silk that tangles the limbs of prey rather than sticking to them.
Seasonal Activity
Active year-round in warmer climates, though they may become more visible indoors during the colder months when males search for mates.
Description
A staple of southern architecture, the Southern House Spider is a master of structural integration. They create 'shaggy' webs in the corners of buildings and are often the spider responsible for the thick silk radiating from small holes in masonry. While large and dark, they are entirely beneficial and non-aggressive neighbors.
Key Features
Velvety appearance, long pedipalps (often looking like a small extra pair of legs in front), and a tight eye cluster. The presence of a messy, radiating web emerging from a crevice is a primary indicator.
Similar Species
Males are often confused with the Brown Recluse (Loxosceles reclusa) but have much longer pedipalps and an eye cluster rather than three pairs of eyes. Females are sometimes mistaken for small tarantulas due to their dark, velvety look.
Life Cycle
Females are long-lived, potentially surviving several years. They carry their egg sacs in their chelicerae (mouthparts) or keep them deep in their retreat. Mating occurs when males wander in search of females.
Ecological Importance
Highly effective at pest control around the home. They consume significant numbers of structural pests like cockroaches and beetles that attempt to hide in crevices.
Conservation Status
Not evaluated by the IUCN; they are abundant and thrive in urbanized environments.
Interesting Facts
The silk of this spider is not sticky; it works like 'Velcro,' grabbing the microscopic hairs on an insect's legs. Females are known for their exceptional longevity among araneomorph spiders.
Photography Tips
Focus on the front of the cephalothorax to capture the eye tubercle. Photographing the web structure along with the spider helps confirm the Filistatidae family.
User Notes
Found hiding and peeking in a crevice outside in a web on the white wall out front of our house on the right side of our house
Identified: 2026-04-25T19:50:21.198837