Long-bodied Cellar Spider, Daddy Long-legs Spider, Skull Spider
Pholcus phalangioides
Pholcidae (Cellar Spiders), Order Araneae
Physical Description
Characterized by an extremely thin, elongated, and somewhat translucent body. The cephalothorax is short and circular, while the abdomen is cylindrical and elongated. They lack the thick exoskeleton of many other spiders, giving them a delicate, fragile appearance.
Size Estimate
Body length is typically 7–9 mm, but the leg span can exceed 50 mm. This specimen appears to be an adult.
Coloration & Markings
Pale tan, greyish, or yellowish-brown. The cephalothorax often features a darker, blurred mark that resembles a skull or a 'violin' (sometimes leading to confusion with recluse spiders). The abdomen is usually a uniform pale color with slight mottling.
Web Type
Messy, irregular tangle web (cobweb) built in corners. The web is not sticky; instead, its complex structure entangles prey.
Eye Arrangement
Eight eyes total: two small median eyes and two lateral groups of three eyes each. The lateral groups are often clustered on small tubercles.
Leg Characteristics
Extremely long, thin, and spindly legs. The legs are approximately 5 to 6 times the length of the body. They lack conspicuous hair or spines and may show faint dark banding at the joints.
Venom & Safety Information
Venom Information
Neurotoxic but extremely mild toward humans. There is an urban myth that they are the most venomous spiders in the world but have fangs too small to bite; this is false. Their venom is potent against insects but not significant for humans.
Medical Significance
Harmless. A bite, though extremely rare, might cause a momentary mild burning sensation but no lasting symptoms or tissue damage.
Safety Recommendations
No action is required as they are harmless. If relocation is desired, use a cup and a piece of paper to gently move them to a garage or shed.
Habitat & Behavior
Habitat & Range
Found worldwide in temperate and tropical regions. They are synanthropic, preferring dark, damp, and undisturbed indoor areas seperti cellars, basements, garages, and ceiling corners.
Behavior & Temperament
Known for a unique defense mechanism: vibrating or 'whirling' rapidly in their web when disturbed to become a blur and evade predators. They are passive and non-aggressive toward humans.
Diet & Prey
Generalist predators consuming flies, mosquitoes, and other spiders. They are notably capable of hunting and killing much larger spiders, including Redbacks or House Spiders, by throwing silk from a distance.
Seasonal Activity
Active year-round in temperature-controlled indoor environments, though sightings may increase in autumn as they seek stable moisture levels.
Description
A common and beneficial resident of human dwellings, the Cellar Spider is easily identified by its exceptionally long legs and vibrating defense. They are the 'cleaners' of the spider world, often keeping other pest populations in check.
Key Features
Elongated cylindrical abdomen, extremely thin legs, and the tendency to hang upside down in a messy web and vibrate when touched.
Similar Species
Often confused with Harvestmen (Opiliones), which have a single body segment and no silk glands, or Brown Recluse spiders (Loxosceles), which have shorter legs and much more dangerous venom.
Life Cycle
Females carry their egg sacs in their chelicerae (mouthparts) until the spiderlings hatch. Life expectancy is approximately 2 to 3 years. Mating can occur year-round in indoor environments.
Ecological Importance
Highly effective at natural pest control. They consume nuisance insects like gnats and mosquitoes and prevent other larger spiders from colonizing the home.
Conservation Status
Not evaluated; stable and common due to their successful adaptation to human-made structures.
Interesting Facts
Despite their fragile look, they are apex predators among house spiders. The myth about their 'deadly' venom was popularized by television, but scientific testing has proven their venom is very weak to mammals.
Photography Tips
Focus on the cephalothorax to capture the eye arrangement. Use a dark background if possible to make the thin, translucent legs visible.
Identified: 2026-07-02T06:27:29.913609