Long-bodied Cellar Spider, Daddy Long-legs Spider, Skull Spider, Vibrating Spider
Pholcus phalangioides
Pholcidae (Cellar Spiders), Order Araneae. Key characteristics include extremely long, delicate legs and a cylindrical abdomen.
Physical Description
Elongated, cylindrical abdomen with a distinct small cephalothorax. The body is translucent-looking with a smooth texture. Dimorphism is present, with females being slightly larger than males.
Size Estimate
Body length 7-9mm; leg span can reach up to 50mm (2 inches). This appears to be an adult specimen based on the leg-to-body ratio.
Coloration & Markings
Pale tan, cream, or grayish-yellow body. The cephalothorax often features a dark, skull-shaped marking on the dorsal side. The legs have darkened joints.
Web Type
Tangle web or cobweb. It is an irregular, haphazard-looking structure built in corners or under furniture (like this table), lacks adhesive, and is used to entangle prey.
Eye Arrangement
8 eyes in total. Six eyes are arranged in two lateral groups of three, plus two small median eyes in the center. This 'triad' grouping is diagnostic for the family.
Leg Characteristics
Extremely long and thin, almost thread-like. They have very flexible tarsi (feet) and lack large spines, appearing nearly transparent or pale straw-colored.
Venom & Safety Information
Venom Information
Weak neurotoxic venom used to subdue small insects. Contrary to urban legends, their venom is not highly toxic to humans, and they are incapable of causing serious harm.
Medical Significance
Harmless to humans. Their fangs are too short to easily penetrate human skin, and in the rare event of a bite, symptoms are limited to a mild, short-lived stinging sensation.
Safety Recommendations
No action is usually necessary. If they are unwanted, they can be easily relocated using the 'cup and paper' method. They are helpful houseguests and do not pose a risk to pets or children.
Habitat & Behavior
Habitat & Range
Cosmopolitan distribution worldwide. Primarily found indoors in homes, basements, and garages, but also under outdoor furniture and in caves. It thrives in temperate and tropical regions.
Behavior & Temperament
Very docile and non-aggressive. When threatened, they engage in 'whirling,' where they vibrate their bodies so fast they become a blur to predators. They are nocturnal hunters.
Diet & Prey
Feeds on mosquitoes, flies, moths, and other spiders. They are known 'araneophagous' hunters, meaning they actively hunt more dangerous spiders like Redbacks or Black Widows.
Seasonal Activity
Active year-round in indoor environments. In outdoor settings, activity peaks in late spring through early autumn.
Description
A familiar resident of human dwellings, this spindly spider is a master of the low-maintenance lifestyle. Its presence is often announced by messy webs in the corners of ceilings or under tables. Despite their fragile appearance, they are formidable predators of other household pests.
Key Features
Cylindrical body shape, extremely long legs, skull-like marking on the cephalothorax, and the behavior of shaking or vibrating when disturbed.
Similar Species
Crossopriza lyoni (Tailed Cellar Spider) which has a more angular abdomen, and various species of 'Harvestmen' (Opiliones), which look similar but have a single fused body segment and no silk.
Life Cycle
Females carry their egg sacs (held in the chelicerae by a few silk threads) until they hatch. Lifespan is approximately 1-3 years depending on food availability.
Ecological Importance
Natural pest control. They significantly reduce populations of indoor disease-carrying insects like mosquitoes and flies without the need for chemical pesticides.
Conservation Status
Not evaluated by the IUCN, but populations are stable and widespread globally due to their association with human structures.
Interesting Facts
There is a persistent urban legend that they are the most poisonous spiders in the world but their fangs are too short to bite; this is false. They are actually top-tier 'janitor' spiders that keep more dangerous species away.
Photography Tips
Focus on the cephalothorax to capture the 'skull' marking. Use a dark background to make the translucent legs visible, and avoid touching the web to prevent them from vibrating and blurring the shot.
Identified: 2026-05-02T14:14:21.549483