Southern House Spider, Barn Funnel Weaver
Kukulcania hibernalis
Filistatidae (Crevice Weavers), Order Araneae. Key family characteristics include cribellate silk production, lack of a venom gland, and a characteristic circular arrangement of the eyes on a raised protuberance.
Physical Description
Robust, velvety appearance with a distinct sexual dimorphism. Females are larger, dark charcoal to brownish-black, with a heavy, velvety texture due to dense fine hairs. Males are smaller, lighter brown to yellowish, with remarkably long, slender legs and elongated pedipalps that can easily make them mistaken for recluses.
Size Estimate
Body length ranges from 9 to 13 mm for females (sometimes up to 19 mm) and 7 to 10 mm for males. Total leg span can reach up to 40-50 mm. The specimen appears to be an adult or subadult male based on the leg proportions and slender build.
Coloration & Markings
Females are uniformly dark charcoal, dark brown, or nearly black with a velvety sheen. Males are paler yellowish-brown or amber, often featuring a faint, subtle chevron pattern or darker shading on the cephalothorax.
Web Type
Builds a characteristic cribellate retreat web consisting of a dense, radial mat of messy, woolly silk emerging from a central crevice, crack, or hole in walls, bark, or window frames. The silk lacks sticky glue and instead physically snares prey using micro-fibers.
Eye Arrangement
Eyes are clustered tightly together on a raised, distinct central tubercle on the anterior of the cephalothorax, which is a key diagnostic feature of the family Filistatidae.
Leg Characteristics
Legs are moderately long and covered in fine setae. Males possess exceptionally long, spindly legs adapted for wide-ranging travel during their search for mates, and prominently display elongated tactile pedipalps at the front.
Venom & Safety Information
Venom Information
Filistatid spiders lack venom glands entirely. Their bites, which are exceedingly rare and only occur under extreme provocation (such as being tightly squeezed against skin), rely solely on mechanical force and are harmless to humans.
Medical Significance
Medically insignificant. They pose virtually zero threat to humans, pets, or livestock. Their bite is comparable to a very mild pinch with no systemic toxicity.
Safety Recommendations
No special safety precautions are required as they are harmless. If a spider is found inside and causes concern, it can be easily relocated outside using a container and a piece of paper.
Habitat & Behavior
Habitat & Range
Found throughout the southeastern United States, including Mobile, Alabama, extending into South America. Highly synanthropic, frequently inhabiting human structures, dark crevices around porches, brick walls, baseboards, and undisturbed indoor corners.
Behavior & Temperament
Very timid, nocturnal, and non-aggressive. When disturbed, they rapidly retreat into their silken bolt-holes. Males wander actively at night searching for females, which often brings them into human living spaces.
Diet & Prey
Carnivorous generalist feeding primarily on crawling arthropods including roaches, crickets, silverfish, and beetles, which are entangled by the non-sticky cribellate web and subdued without powerful venom.
Seasonal Activity
Active year-round indoors, but wandering adult males are most commonly encountered during warm summer and autumn nights when they actively search for females.
Description
The Southern House Spider is a familiar and harmless resident of southern homes. Often mistaken for the brown recluse due to the wandering male's coloration and long legs, this velvety arachnid is actually a beneficial and completely venomless pest controller. They quietly tend to their messy web mats spun tightly against baseboards or window corners, helping keep household insect populations in check.
Key Features
Velvety body texture, raised eye tubercle where all eyes are grouped closely together, lack of venom glands, and the presence of woolly, non-sticky cribellate silk webs in crevices.
Similar Species
Brown Recluse (Loxosceles reclusa). Distinguished by the recluse's violin-shaped dorsal marking, distinct eye arrangement (six eyes in three dyads), and lack of the velvety texture and raised eye tubercle found in Kukulcania hibernalis.
Life Cycle
Females construct silken egg sacs hidden within their retreats containing up to several hundred eggs. Spiderlings disperse shortly after hatching. Females can live for several years in favorable conditions, whereas adult males live only a few months after maturing.
Ecological Importance
Acts as an effective natural pest control agent within homes and outbuildings, consuming substantial numbers of roaches, beetles, and other household insect pests.
Conservation Status
Not evaluated by the IUCN, but secure, widespread, and locally abundant throughout its range.
Interesting Facts
Despite their intimidating appearance and common name confusion with dangerous spiders, Southern House Spiders are entirely venomless and rely on specialized comb-like cribellum silk to physically tangle their prey.
Photography Tips
Use macro lighting to highlight the velvety texture of the body and the distinct, raised eye cluster on the head. Maintain a calm approach as sudden movements will cause them to dash into hiding.
User Notes
Found in house in mobile alabama
Identified: 2026-08-03T12:13:35.710838