Wall Spider, Star Spider, Stucco Spider
Oecobius cf. navus
Family Oecobiidae (Wall Spiders), Order Araneae. Characterized by being small, flat-bodied, and having a large, tufted anal tubercle.
Physical Description
Extremely small with a flattened, circular or pear-shaped cephalothorax. The abdomen is typically ovate and slightly broader than the head. A key anatomical feature is the large, prominent anal tubercle surrounded by a fringe of long hairs, used for silk manipulation.
Size Estimate
Minute; adult body length is typically 2mm to 2.5mm (roughly the size of a grain of rice). Leg span is usually under 5mm.
Coloration & Markings
Typically a mottled gray, cream, or tan base with darker spots or symmetric patterns on the abdomen and cephalothorax. The legs often show faint dark banding or rings.
Web Type
They build small, flat, two-layered sheet webs (tents) over cracks or crevices on walls. These webs are not used for entanglement but as a base from which they emerge to hunt.
Eye Arrangement
8 eyes arranged in a compact group near the front of the cephalothorax. The layout is somewhat circular, which provides excellent peripheral vision for detecting prey on flat surfaces.
Leg Characteristics
The legs are relatively short and extend outward in a star-like (radial) fashion. When disturbed, they are capable of extremely rapid, scurrying movements in circular patterns.
Venom & Safety Information
Venom Information
Possess venom used to subdue small insect prey, but it is not known to be complex or potent against vertebrates.
Medical Significance
None. They are entirely harmless to humans and pets. Their mouthparts are generally too small to penetrate human skin even if they attempted to bite.
Safety Recommendations
No safety precautions are necessary. These spiders are beneficial. If relocation is desired, use a soft brush to sweep them into a container; however, they are so small they are best left alone.
Habitat & Behavior
Habitat & Range
Cosmopolitan distribution; found worldwide in temperate and tropical regions. They are highly synanthropic, meaning they are frequently found on the indoor and outdoor walls of human dwellings.
Behavior & Temperament
They are active hunters with a unique capture method: they run rapidly in circles around their prey (usually ants or flies), tethering the victim to the wall with silk 'straps' until it is immobilized.
Diet & Prey
Primarily small insects with a strong preference for ants. They also consume tiny flies and other small domestic arthropods.
Seasonal Activity
Active year-round in indoor environments. Outdoors, they are most visible during the warmer spring and summer months.
Description
The Wall Spider is a tiny, often overlooked roommate in many households. Resembling a moving speck of dust, it is an architectural specialist that thrives on vertical surfaces like stucco and drywall, providing free pest control.
Key Features
Minute size, star-like leg arrangement, rapid circular running behavior, and occurrence on vertical walls near ceiling corners or cracks.
Similar Species
Often confused with spiderlings of larger species like Wolf Spiders or Filmy Dome Spiders, but distinguished by their unique circular running gait and fringed anal tubercle.
Life Cycle
Females lay thin, silk-covered egg sacs containing a small number of eggs (usually 3-10). Spiderlings emerge looking like miniature adults and do not undergo substantial metamorphosis.
Ecological Importance
Act as a significant natural biological control for indoor pests, particularly ants and small flies, reducing the need for chemical pesticides.
Conservation Status
Not evaluated (NE). They are extremely common and widespread with no known threats to their populations.
Interesting Facts
Despite their tiny size, they are one of the few spiders specialized in hunting ants, which are dangerous prey for many larger spiders due to their chemical defenses and biting mandibles.
Photography Tips
A macro lens is essential due to their 2mm size. Use a high shutter speed to capture them, as they are exceptionally fast and prone to sudden bursts of movement.
Identified: 2026-07-17T06:58:32.484455