Cellar Spider, Daddy Long-Legs
Pholcidae (likely Pholcus phalangioides)
Pholcidae (Cellar Spiders), Order Araneae. Key family characteristics include very long, delicate legs and small, oval to cylindrical abdomens.
Physical Description
The spider has a compact cephalothorax and a distinctly elongated, cylindrical abdomen. The limbs are exceptionally long and thread-like relative to the small body size.
Size Estimate
Body length is approximately 6 to 10 millimeters, with a total leg span reaching up to 50 millimeters.
Coloration & Markings
Pale gray, tan, or light brown coloration with subtle darker markings on the cephalothorax and abdomen.
Web Type
Irregular, three-dimensional tangle webs constructed in corners, ceilings, and dark recesses.
Eye Arrangement
Eight eyes clustered on a raised protuberance on the front of the cephalothorax, consisting of a triad on each side and a pair of smaller median eyes.
Leg Characteristics
Extremely long, thin, and fragile legs with slight dark banding. They lack heavy spination and vibrate rapidly when disturbed.
Venom & Safety Information
Venom Information
Mild venom utilized exclusively for subduing small insect prey. Completely harmless to humans.
Medical Significance
No medical significance. Their chelicerae are generally too weak or too small to successfully pierce human skin.
Safety Recommendations
No safety precautions required. They are completely harmless and beneficial roommates that can be gently relocated outside if unwanted.
Habitat & Behavior
Habitat & Range
Cosmopolitan distribution globally. Frequently found indoors in human dwellings, basements, garages, and damp cellars.
Behavior & Temperament
Docile and non-aggressive. When threatened, they rapidly vibrate their bodies within the web to become a blur and evade predators.
Diet & Prey
Insects and other spiders, including medically significant species like venomous widows, which they subdue using long silk wraps.
Seasonal Activity
Active year-round indoors, taking advantage of climate-controlled environments within buildings.
Description
The cellar spider is a familiar household guest, often recognized by its impossibly long legs and messy corner webs. Though frequently dismissed as a nuisance, it is a harmless and highly effective household predator.
Key Features
Extremely long, thread-like legs paired with a small, elongated cylindrical body and a penchant for vibrating when disturbed.
Similar Species
Harvestmen (Opiliones), which are arachnids but not true spiders; harvestmen have a single fused oval body segment and lack silk glands.
Life Cycle
Females carry eggs in a loose silk cluster held in their jaws. Spiderlings hatch and molt multiple times, with adults living for several years.
Ecological Importance
Serves as a natural pest control agent inside homes by feeding on nuisance insects and competing with other indoor spiders.
Conservation Status
Not evaluated by the IUCN, but highly secure and widespread due to successful commensalism with human habitats.
Interesting Facts
Urban legends claim cellar spiders possess the most potent venom but lack the fangs to deliver it, which is scientifically inaccurate; their venom is quite weak.
Photography Tips
Use macro lenses with adequate side lighting to capture the delicate leg structure and eye grouping against a neutral background.
User Notes
Identified: 2026-09-14T04:21:16.230129