Long-bodied Cellar Spider, Daddy Long-legs Spider, Skull Spider, Vibrating Spider
Pholcus phalangioides
Pholcidae (Cellar Spiders), Order Araneae. Characterized by extremely long, delicate legs and a small, elongated cylindrical abdomen.
Physical Description
The specimen displays the characteristic small, cylindrical, and elongated abdomen of a pholcid. The cephalothorax is relatively flat with a faint dark mark. The body appears translucent or pale, typical of spiders that spend lives in sheltered, low-light environments.
Size Estimate
Body length is likely between 7-9 mm. Leg span can reach up to 50 mm. The extremely thin legs make the spider appear larger than its actual body mass.
Coloration & Markings
Pale tan, grey, or yellowish-brown. The abdomen often has faint mottled markings, and the cephalothorax features a dark, blurry central spot that some compare to the shape of a human skull.
Web Type
Tangle web or 'cobweb'. It is an irregular, messy-looking web of non-sticky silk, usually built in corners of ceilings or under floorboards.
Eye Arrangement
They typically have eight eyes: two small median eyes and two lateral groups of three eyes each. The lateral groups are often situated on slightly raised triads.
Leg Characteristics
Infamous for extremely long, spindly, and fragile legs. The legs are roughly 5 to 6 times the length of the body and lack significant spination but are highly flexible.
Venom & Safety Information
Venom Information
Contains protein-based venom intended for small invertebrates. Contrary to urban legends, it is not 'the most toxic venom in the world'; it is quite mild at the concentrations used.
Medical Significance
Harmless to humans. Their fangs are too small to easily penetrate human skin, and in the rare event of a bite, the result is typically just a mild, short-lived stinging sensation.
Safety Recommendations
No safety measures are required as they are non-toxic to humans. If relocation is desired, they can be easily moved using a cup and a piece of paper. Avoid using glue traps as they are unnecessarily lethal for this beneficial species.
Habitat & Behavior
Habitat & Range
Cosmopolitan distribution; found worldwide in association with human structures. Prefers dark, damp, or undisturbed locations like basements, cellars, attics, and garages.
Behavior & Temperament
Sedentary and non-aggressive. When threatened, they exhibit a unique 'whirling' or 'shaking' behavior, vibrating rapidly in their web to become a blur to predators.
Diet & Prey
Generalist predators consuming small insects, moths, and notably other spiders. They are efficient hunters of much larger spiders, including Redbacks or House Spiders.
Seasonal Activity
Active year-round in temperature-controlled indoor environments, though they may be more visible during summer months as prey abundance increases.
Description
A ubiquitous sight in homes worldwide, the Cellar Spider is a delicate-looking yet formidable hunter. Often confused with Opiliones (Harvestmen), these true spiders are master architects of irregular corner webs. They are highly beneficial indoor companions that actively hunt more troublesome pests.
Key Features
Extremely long, thin legs; cylindrical elongated abdomen; pale translucent body; tendency to vibrate rapidly when disturbed.
Similar Species
Physocyclus globosus (Short-bodied cellar spider) has a more rounded abdomen. Also often confused with Harvestmen (Opiliones), which have a single body segment rather than two.
Life Cycle
Females carry their egg sacs (containing 20-30 eggs) in their chelicerae (mouthparts) rather than attaching them to the web. They can live up to 2-3 years in stable indoor environments.
Ecological Importance
Crucial for indoor pest control. They regulate populations of flies, gnats, and other spiders, providing a natural and free pest management service in residences.
Conservation Status
Not evaluated by the IUCN, but populations are stable and widespread globally due to their success in human-altered habitats.
Interesting Facts
There is a persistent urban legend that they are the most venomous spiders in the world but their fangs are too short to bite; this is false. While they are venomous to insects, they are not dangerous to humans.
Photography Tips
Use a macro lens if possible; because they are translucent, backlighting can reveal internal organs. To capture the eye triad, a direct head-on shot is necessary.
Identified: 2026-06-15T13:48:39.782670