Long-bodied Cellar Spider, Daddy Long-legs Spider, Skull Spider
Pholcus phalangioides
Pholcidae (Cellar Spiders), Order Araneae. Characterized by extremely long, thin legs and hanging upside down in messy webs.
Physical Description
The spider has a small, elongated, cylindrical abdomen and a slightly flattened cephalothorax. The body texture appears smooth or very finely haired. They have a characteristic 'waist' and a somewhat translucent body appearance.
Size Estimate
The body length is typically 7-8 mm (approx. 0.3 inches). The leg span is significantly larger, often reaching up to 50 mm (2 inches). This specimen appears to be an adult or sub-adult.
Coloration & Markings
Generally pale tan, light brown, or grayish-yellow. The cephalothorax often features a dark, blurred mark that resembles a skull (giving them the nickname 'skull spider'). The abdomen is solid or slightly mottled without distinct bright colors.
Web Type
They build irregular, tangled, non-adhesive 'cobwebs.' These webs are usually horizontal sheet-like structures built in corners or dark recesses. They do not recycle their silk, leading to large accumulations of dust-covered webs.
Eye Arrangement
They possess eight eyes arranged in three groups: a pair of small eyes in the middle and two groups of three larger eyes on the sides. This specific triad arrangement is a hallmark of the Pholcidae family.
Leg Characteristics
Legs are exceptionally long, slender, and delicate—often several times the length of the body. They lack heavy spines or banding but may have slightly dark joints. They often adopt a 'tangled' posture when resting.
Venom & Safety Information
Venom Information
The venom is highly effective against insects and other spiders but is not considered harmful to humans. Myth states they are the 'most venomous spiders in the world,' but this is biologically false; their venom is quite weak to mammals.
Medical Significance
Virtually harmless. Their fangs are very short and rarely capable of penetrating human skin. Even if a bite occurs, it typically results in a mild, short-lived stinging sensation with no long-term effects.
Safety Recommendations
No special safety measures are needed. If found in a shoe or clothing, simply shake them out; they will likely flee. For relocation, use a jar and a piece of paper to move them to a garage or shed where they can continue catching insects.
Habitat & Behavior
Habitat & Range
Cosmopolitan distribution, found worldwide. They are synanthropic, preferring human-made structures like basements, garages, closets, and eaves. In warmer climates, they may be found in caves or under rock overhangs.
Behavior & Temperament
Extremely docile and non-aggressive. When threatened, they perform a 'whirling' or 'vibrating' behavior in their web, making themselves a blur to confuse predators. They are sedentary hunters that stay in their webs.
Diet & Prey
They eat insects and other spiders. Remarkably, they are known to invade the webs of other spiders (including much larger or more venomous ones like Black Widows) to kill and eat them. They wrap prey in silk before biting.
Seasonal Activity
Active year-round in temperature-controlled indoor environments. In unheated areas, they are most visible during the summer and autumn months.
Description
The Long-bodied Cellar Spider is one of the most common spiders found in households globally. Known for its delicate, spindly silhouette, it is often seen hanging upside down in corners. While their messy webs can be a nuisance, they are highly beneficial roommates that act as natural pest controllers.
Key Features
Extremely long thin legs, cylindrical abdomen, vibrating defense behavior, and the habit of carrying egg sacs in the mouth.
Similar Species
Often confused with Harvestmen (Opiliones) which are not true spiders and have a single fused body segment. Also confused with Smeringopus species, which are more common in tropical regions and have darker abdominal markings.
Life Cycle
Females carry their egg sacs in their chelicerae (mouthparts) using a few silk threads rather than attaching them to the web. After hatching, spiderlings stay near the mother for a short time. They can live up to 2-3 years.
Ecological Importance
They are top-tier apartment-dwelling predators that control populations of flies, gnats, and more concerning spiders like Recluses or Widows, maintaining a balance in indoor ecosystems.
Conservation Status
Not evaluated by the IUCN. They are extremely common and widespread with no known threats to their populations.
Interesting Facts
The 'Daddy Long-legs' myth suggests they are lethal but have fangs too short to bite humans—in reality, their venom is not toxic to humans anyway. They are also known as 'araneophagous,' meaning they specialize in eating other spiders.
Photography Tips
Focus on the cephalothorax to capture the 'skull' markings. Use a dark background if possible to make the translucent legs visible. Use macro mode to see the eye groups, which are diagnostic for the family.
Identified: 2026-07-20T20:53:04.671564