Wall Spider, Wall Spinner
Oecobius cf. navus
Oecobiidae (Wall Spiders), Order Araneae. Characterized by a flat, disc-like appearance and a large anal tubercle used for silk spinning.
Physical Description
Extremely small, flat spiders with a cephalothorax that is nearly circular. The abdomen is oval with a distinctive large, fringe-like anal tubercle at the posterior end. They have a silk-spinning apparatus used to encircle prey.
Size Estimate
Body length is typically 2mm to 3mm. This appears to be an adult specimen, as its proportions are consistent with mature individuals of the Oecobiidae family.
Coloration & Markings
Typically mottled cream, tan, or grey with dark flecks or patterns on the abdomen. The legs often feature faint dark banding.
Web Type
They build small, flat, star-shaped sheet webs over crevices or corners on walls. The web serves as a retreat rather than a trap; they hunt by running out and encircling prey with silk.
Eye Arrangement
Six or eight eyes arranged in a compact, central cluster on the top of the cephalothorax, often making them look like they have a single dark spot when viewed from a distance.
Leg Characteristics
The legs are relatively short and extend outward laterally (crab-like posture), allowing for rapid, erratic spinning movements when capturing prey.
Venom & Safety Information
Venom Information
Possess venom used to immobilize small insects, but it is not potent enough to affect humans.
Medical Significance
Harmless to humans. Their chelicerae (fangs) are typically too small to penetrate human skin. No medical intervention is required for contact.
Safety Recommendations
No action is required. They are beneficial for pest control. If removal is desired, they can be gently swept away with a soft brush.
Habitat & Behavior
Habitat & Range
Cosmopolitan distribution, frequently found in and around human dwellings. They prefer vertical surfaces, textured walls, and ceilings in both indoor and outdoor environments.
Behavior & Temperament
Very fast and erratic runners. When they detect prey, they sprint in tight circles around the insect, rapidly wrapping it in silk. They are non-aggressive and shy toward humans.
Diet & Prey
Generalist predators focusing on small insects, particularly ants. They are highly efficient at capturing ants that are much larger than themselves.
Seasonal Activity
Active year-round in indoor environments. Outdoors, they are most visible during the warmer months.
Description
A tiny, inconspicuous tenant of many homes, the Wall Spider is a master of speed. Viewed under magnification, these spiders reveal a beautifully mottled pattern that helps them blend into textured surfaces. They are most famous for their 'spinning' hunting maneuver, where they orbit their prey at high speed to bind it.
Key Features
Tiny size (under 3mm), flat circular body, and the habit of living in small webs on walls. The most diagnostic trait is the large, hairy anal tubercle.
Similar Species
Can be confused with juvenile Philodromidae (Running Crab Spiders) or very small Gnaphosidae, but the unique circular body and wall-dwelling web habit are distinctive.
Life Cycle
Females produce small, flat, white egg sacs containing a few eggs, usually hidden within their web retreat. They are known for a relatively short lifespan of about a year.
Ecological Importance
Excellent natural pest control, particularly for household ants and small flies. They occupy a niche that many larger spiders cannot use.
Conservation Status
Not evaluated by the IUCN. They are considered common and widespread, often benefiting from human architecture.
Interesting Facts
The Wall Spider's anal tubercle is surrounded by long hairs that help manipulate silk into a 'ribbon' used to wrap prey while the spider runs in circles.
Photography Tips
Due to their tiny size, a macro lens is essential. Focus on the dorsal (top) view to capture the circular body shape and the anal tubercle at the rear.
Identified: 2026-07-07T14:29:33.896448