Long-bodied Cellar Spider, Daddy Long-legs Spider, Skull Spider
Pholcus phalangioides
Pholcidae (Cellar Spiders), Order Araneae. Notable for their extremely long, thin legs and preference for quiet, indoor spaces.
Physical Description
Small, cylindrical body with a pale, nearly translucent abdomen and a somewhat flattened cephalothorax. The body is divided into two distinct parts: a rounded cephalothorax and an elongated abdomen. They appear fragile and delicate.
Size Estimate
Body length: 7–10 mm; Leg span: Up to 50 mm (2 inches). The specimen in the image appears to be an adult characteristic of indoor environments.
Coloration & Markings
Palid tan, grey, or cream-colored body. The cephalothorax often features a darker, blurred mark that resembles a skull (hence the name 'Skull Spider'). Legs are semi-translucent with darker joints.
Web Type
Tangle web or 'cobweb'. Extensive, messy, non-sticky sheets of silk built in corners, ceilings, or dark recesses where air current is minimal.
Eye Arrangement
8 eyes in total: two small eyes in front and two lateral clusters of three larger eyes. This cluster pattern is diagnostic for the Pholcidae family.
Leg Characteristics
Extremely long, spindly, and fragile-looking. They lack the robust spination of many hunting spiders. When threatened, they use these legs to bounce rapidly in their web.
Venom & Safety Information
Venom Information
Contains proteinaceous venom effective against small invertebrates. Contrary to urban legends, their venom is not highly toxic to humans, nor are their fangs too short to bite.
Medical Significance
Harmless. Bites are extremely rare as they generally flee. If a bite occurs, it usually results in a mild, short-lived burning sensation or no reaction at all.
Safety Recommendations
No specific safety measures needed. If they are unwelcome, they can be gently relocated outside using a cup and paper. They do not pose a risk to children or pets.
Habitat & Behavior
Habitat & Range
Cosmopolitan distribution; found worldwide. Highly adapted to human habitations, preferring dark, damp areas like cellars, basements, closets, and room corners.
Behavior & Temperament
Sedentary and docile. Their primary defense is 'whirling'—vibrating so rapidly in their web that they become a blur to predators. They are non-aggressive toward humans.
Diet & Prey
Insects and other spiders. Known to leave their webs to hunt other spiders, including much larger species like House Spiders or even Redback/Widow spiders.
Seasonal Activity
Active year-round in temperature-controlled indoor environments, though sightings may increase in autumn as they seek stable conditions.
Description
A ubiquitous indoor resident often seen hanging upside down in the corners of rooms. While their messy webs can be a nuisance, they are highly efficient biological pest controllers that actively target other household pests.
Key Features
Exaggeratedly long legs, cylindrical pale abdomen, and the 'whirling' defensive behavior within a messy tangle web.
Similar Species
Harvestmen (Opiliones), which are not spiders and have a single body segment; and Smeringopus pallidus, which has more distinct purple or brown spots on the abdomen.
Life Cycle
Females carry their egg sacs in their chelicerae (mouthparts) until they hatch. Spiderlings remain near the mother for a short time before dispersing. Can live up to 2–3 years.
Ecological Importance
Significant indoor predators. They keep populations of flies, gnats, and more formidable spiders in check, maintaining a natural balance within homes.
Conservation Status
Not Evaluated (Stable/Common). Their association with humans ensures a wide and secure population.
Interesting Facts
There is a persistent urban myth that they are the most venomous spiders in the world but cannot bite humans. This is false; their venom is relatively weak compared to truly dangerous spiders.
Photography Tips
Focus on the eye cluster or the skull-like marking on the cephalothorax. Use a macro lens if possible, as their thin legs can be difficult for autofocus to track against a plain wall.
Identified: 2026-05-29T16:38:54.579265