Long-bodied Cellar Spider, Daddy Long-Legs Spider, Skull Spider
Pholcus phalangioides
Pholcidae (Cellar Spiders), Order Araneae. Key family characteristics include extremely long, delicate legs, fused or cylindrical body shape, and messy, non-sticky web structures.
Physical Description
Small, elongate body with a distinct division between the oval cephalothorax and cylindrical abdomen. The body appears delicate, smooth, and semi-translucent, supported by exceptionally long, thin legs.
Size Estimate
Body length is typically 6 to 10 mm (0.24 to 0.4 inches), but with leg span, it easily reaches 30 to 50 mm (1.2 to 2 inches) or more. This specimen appears to be an adult.
Coloration & Markings
Pale yellowish-grey, translucent tan, or light brown body. The cephalothorax features a dark, smudge-like central patch resembling a human skull or peanut outline. The legs are uniform tan with darker joint rings.
Web Type
Irregular, loose, non-sticky tangle web or cobweb built in quiet, dark corners, ceilings, basements, and crawl spaces.
Eye Arrangement
8 eyes in total: two triads (groups of three) on the sides and two smaller anterior median eyes in the center, elevated on a small ocular tubercle.
Leg Characteristics
Extremely long, stilt-like, and slender legs that are many times the length of the body. Very fine, lacking thick spines, flexible towards the tips, with faint dark bands near joints.
Venom & Safety Information
Venom Information
Contains mild, weak neurotoxic venom specialized for immobilizing small arthropods. Completely harmless to humans; fangs are very small and rarely capable of puncturing human skin.
Medical Significance
Harmless / Non-medically significant. A bite causes at most a mild, momentary localized burning sensation without serious systemic symptoms.
Safety Recommendations
No safety precautions required. If unwanted indoors, gently capture using the cup-and-paper method and relocate to a shed, garage, or sheltered outdoor area.
Habitat & Behavior
Habitat & Range
Synanthropic species found globally (cosmopolitan distribution). Highly common indoors in basements, cellars, garages, attics, bathroom corners, and behind furniture.
Behavior & Temperament
Extremely docile and non-aggressive. When threatened in its web, it rapidly whirls or vibrates its body in a circle ('vibrating' or 'shaking' behavior) to blur its vision to predators.
Diet & Prey
Insects such as flies, mosquitoes, ants, and silverfish, as well as other spiders including much larger species like house spiders, wolf spiders, and even black widows.
Seasonal Activity
Active year-round indoors in climate-controlled environments; in natural or unheated habitats, peak activity occurs from late spring through autumn.
Description
The Long-bodied Cellar Spider (Pholcus phalangioides) is one of the most common arachnids found inside human habitations across the globe. Known for its impossibly long, hair-thin legs and small, cylindrical torso, this creature is a master of passive pest control. Despite urban legends claiming it possesses the 'most deadly venom in the world,' it is entirely harmless to humans and serves as a highly beneficial, quiet housemate that keeps other household pests at bay.
Key Features
Elongated cylindrical abdomen, extremely thin legs, faint skull-shaped mark on carapace, rapid body-whirling defense mechanism, carrying egg sacs in mouthparts.
Similar Species
Harvestmen / Daddy Longlegs (Opiliones - not true spiders, single fused body unit), Spitting Spiders (Scytodidae - shorter legs, dome-shaped carapace), Brown Recluse (Loxosceles reclusa - broader legs, distinct violin shape, lacks elongated cylindrical abdomen).
Life Cycle
Females carry egg sacs containing 20 to 30 eggs wrapped loosely in silk using their chelicerae rather than leaving them in a web. Lifespan is approximately 2 to 3 years.
Ecological Importance
Serves as an exceptional natural pest controller in indoor environments, reducing populations of flies, gnats, mosquitoes, silverfish, and unwanted predatory spiders.
Conservation Status
Not evaluated by the IUCN. Extremely widespread, stable, and abundant due to its association with human habitats.
Interesting Facts
A popular urban myth claims cellar spiders have the most potent venom in the world but cannot bite humans due to short fangs; scientific testing has proven both claims false (venom is weak and fangs can pierce skin, but effects are negligible). They are active hunters of other venomous spiders, including redbacks and black widows.
Photography Tips
Use a macro lens or high digital zoom with indirect lighting. Photograph the distinct carapace pattern from directly above, or capture the egg sac carried in the mouthparts if present.
Identified: 2026-07-27T16:36:54.894955