Long-bodied Cellar Spider, Daddy Long-legs Spider, Skull Spider
Pholcus phalangioides
Pholcidae (Cellar Spiders), Order Araneae. Characterized by extremely long, thin legs and a small, delicate body.
Physical Description
The spider has a small, elongated cylindrical abdomen that is semi-translucent. The cephalothorax (head region) is roughly circular with a faint pattern. They are known for their incredibly thin, hair-like legs that give them a fragile appearance.
Size Estimate
The body length is typically 7–9 mm, but with its extremely long legs, the total leg span can reach up to 50–60 mm. The specimen in the image appears to be an adult.
Coloration & Markings
Pale tan, grayish, or light brown overall. The abdomen is often a uniform pale color, while the cephalothorax features a darker, blurred mark in the center that some say resembles a human skull, giving rise to one of its common names.
Web Type
Tangle web or cobweb. These are irregular, non-sticky silk structures built in corners, often appearing messy or neglected. When threatened, the spider vibrates rapidly in the web to blur its image.
Eye Arrangement
Eight eyes arranged in three groups: two lateral groups of three and one central pair of two. These eyes are small and difficult to see without magnification.
Leg Characteristics
Legs are exceptionally long, slender, and flexible. They lack prominent spines and possess a 'pseudo-articulation' making them very mobile. The legs often appear darker at the joints.
Venom & Safety Information
Venom Information
The venom is not medically significant to humans. While it is effective at paralyzing small invertebrate prey, there is an urban legend that they are the 'most venomous spider'—this is false and unsubstantiated.
Medical Significance
Harmless to humans. Their fangs are generally considered too small to effectively penetrate human skin, and even if a bite occurred, the reaction would be negligible (mild redness or itching).
Safety Recommendations
No action is usually needed as they are harmless. If they become too numerous, they can be easily moved outside using a cup and a piece of paper. Their presence usually indicates a food source (insects) is available.
Habitat & Behavior
Habitat & Range
Cosmopolitan distribution found worldwide. They prefer dark, damp, or secluded areas such as basements, attics, cellars, and corners of ceilings in homes (as seen in the photo).
Behavior & Temperament
Sedentary and non-aggressive. When disturbed, they perform a defense mechanism called 'whirling,' where they vibrate their bodies so fast they become a blur. They are active hunters within their webs.
Diet & Prey
Insects and other spiders. They are efficient predators known to kill and eat larger spiders, including house spiders and occasionally highly venomous species like Redbacks or Black Widows.
Seasonal Activity
Active year-round in indoor environments where temperatures remain stable. Mating can occur at any time, but increased activity may be noticed in late summer and autumn.
Description
A ubiquitous indoor companion, the Cellar Spider is one of the most common arachnids found in human dwellings. With its delicate frame and impossibly long legs, it is a master of corners. It plays a vital role as a domestic pest controller, silently managing insect and spider populations in the nooks and crannies of our homes.
Key Features
Distinguished by the cylindrical abdomen, extremely long legs relative to body size, and the characteristic 'vibrating' behavior when the web is touched.
Similar Species
Often confused with Harvestmen (Opiliones), which are not true spiders as they have one body segment and no silk glands. Also similar to other Pholcid species like Holocnemus pluchei, which has a distinct dark stripe on the underside of the abdomen.
Life Cycle
Females carry their egg sacs in their chelicerae (mouthparts) rather than attaching them to the web. The young spiderlings stay with the mother for a short time after hatching before dispersing. They can live up to 3 years.
Ecological Importance
Highly beneficial in the home. They act as natural pest control, keeping populations of flies, gnats, and even other potentially more dangerous spiders in check.
Conservation Status
Not evaluated by IUCN, but extremely common and widespread; there are no conservation concerns.
Interesting Facts
The urban myth that their venom is the most deadly in the world but their fangs are too short represents one of the most persistent pieces of false spider lore. In reality, their venom is quite weak and poses no threat to people.
Photography Tips
Focus on the cephalothorax to capture the eye arrangement or 'skull' marking. Backlighting the web can help highlight the silk structure, but macro shots are needed for body details due to their small size.
Identified: 2026-07-01T03:03:56.406506