Overview
The Barn Funnel Weaver (Tegenaria domestica), celebrated across global arachnology and domestic folklore as the Domestic House Spider, Common Funnel-web Spider, or Cobweb Weaver, is a widely familiar, highly agile, and biologically extraordinary agelenid spider native originally to Europe and temperate Asia. Having traveled alongside human civilization for millennia via global shipping, this peaceful domestic companion has established itself as one of the most successful and cosmopolitan household arachnids on planet Earth.
Clad in a mottled, pale yellowish-brown to grey-buff body patterned with dark charcoal-brown chevrons and spots, Tegenaria domestica is world-famous as an architectural master of silk: in dark, undisturbed corners of barns, cellars, and attics, it weaves an expansive, horizontal, non-sticky sheet web that tapers at the rear into a dense, conical, tube-like funnel retreat. Resting hidden at the mouth of her funnel, the spider senses the microscopic vibrations of walking insects; bursting forth with blinding, lightning-fast sprint velocity, it tackles prey in fractions of a second. Completely harmless to humans and providing invaluable natural pest control, the barn funnel weaver is a celebrated marvel of domestic biodiversity.
AT A GLANCE
- Common Name: Barn Funnel Weaver
- Scientific Name: Tegenaria domestica
- Category: Invertebrates
- Subcategory: Arachnids
- Size: Body length: adult females 9–12 mm (0.35–0.47 in); adult males 6–9 mm (0.24–0.35 in); leg span 35–50 mm (1.4–2.0 in)
- Weight: 0.1–0.3 g (0.0035–0.011 oz)
- Lifespan: 2–4 years in the wild; females can survive up to 5–7 years in undisturbed buildings
- Diet: Carnivorous nocturnal ambush predator feeding on flies, mosquitoes, silverfish, carpet beetles, cockroaches, moths, and woodlice
- Habitat: Traditional human structures, dark basements, stone barns, outbuildings, cellars, caves, rock crevices, and undisturbed wall crevices
- Range: Cosmopolitan, natively Palearctic throughout Europe, North Africa, and temperate Asia; widely introduced and established globally through human shipping across North America, South America, southern Africa, and Australasia
- Conservation Status: Not Evaluated
Biology and Physical Characteristics
Morphologically, Tegenaria domestica is engineered for high-speed cursorial sprinting across silk sheets. Its cephalothorax is elongated and yellow-brown, marked with two distinct, dark longitudinal bands. Its abdomen is oval and adorned with an exquisite, pale grey-and-brown herringbone (chevron) pattern down the center, flanked by dark spots. Its eight eyes are arranged in two slightly curved horizontal rows of four, adapted for detecting sudden visual motion in dim light. Its legs are long, slender, and distinctly ringed or mottled with faint dark bands, covered in specialized fine spines and sensitive vibration-detecting hairs (trichobothria). Unlike orb-weaver spiders, its silk spinnerets produce smooth, non-sticky silk; the spider’s feet possess specialized pectinate claws that allow it to sprint across its own silk sheet at speeds exceeding fifty centimeters per second without tangling or slipping. It possesses small chelicerae and mild venom that poses zero medical danger to humans.
Behavior and Ecology
Behaviorally, barn funnel weavers are strictly nocturnal and solitary. The web is an impressive permanent structure: the spider builds a vast horizontal silk sheet anchored to wall corners or floorboards, with a silk-lined funnel retreat at the corner leading into a dark crevice. Over months and years, the spider continually adds new silk layers to the sheet, creating a dense, opaque white carpet. The spider rests inside the funnel, placing its front legs on the silk threads to monitor tensions; when a housefly or silverfish steps onto the sheet, the spider feels the exact frequency of the vibrations, dashes out at breathtaking speed, bites the insect to inject paralyzing venom, and drags the carcass backward into its funnel lair to eat. Mating occurs in spring: the male approaches the female’s web with delicate, rhythmic strumming vibrations on the silk to signal his identity; after mating, males often cohabit peacefully on the web for weeks before dying. Females construct a spherical, white silk egg sac camouflaged with plaster dust and wood shavings, hanging it near the funnel entrance.
Conservation and Human Impact
The Barn Funnel Weaver has not been formally evaluated (Not Evaluated) by the IUCN Red List of Threatened Species, but it is universally recognized by arachnologists as globally secure, abundant, and widespread across human-modified habitats worldwide. As an obligate synanthropic companion across temperate zones, it thrives in human structures where it provides invaluable biological pest control services, hunting nuisance insects including clothes moths, silverfish, and mosquitoes. In recent decades in parts of western Europe and North America, its numbers in residential homes have faced competition from the larger, related Giant House Spider (Eratigena atrica), but it remains common in rural barns and outbuildings.
Interesting Factoid
The barn funnel weaver is an Olympic-level sprinter—it can run across its silk web sheet at a blistering speed of nearly two feet per second, which, scaled up to human size, would be like a human sprinting at over 140 miles per hour!