Long-bodied cellar spider, daddy long-legs spider
Pholcus phalangioides
Pholcidae (Cellar Spiders), Order Araneae
Physical Description
Characterized by an extremely slender and delicate body structure with a small, oval cephalothorax and an elongated, cylindrical abdomen. The legs are disproportionately long and thread-like compared to the tiny body.
Size Estimate
Body length ranges from 7 to 10 millimeters, with a massive leg span reaching up to 5 to 7 centimeters.
Coloration & Markings
Pale, translucent tan, gray, or yellowish color overall. The cephalothorax often features a faint darker marking or greyish pattern near the center, and the abdomen may display subtle greyish spots.
Web Type
Irregular, loose, three-dimensional tangle webs constructed in dark, damp corners, cellars, ceilings, and behind furniture.
Eye Arrangement
Eight eyes arranged in three groups: a triad on each side and a pair of smaller median eyes closely set in the front.
Leg Characteristics
Extremely long, thin, fragile legs with flexible joints that allow the spider to vibrate rapidly when disturbed, making it appear blurred.
Venom & Safety Information
Venom Information
Contains mild, highly specific venom designed for invertebrate prey. Although myths claim otherwise, their venom poses virtually no threat to humans.
Medical Significance
Medically insignificant. Their chelicerae are generally too small or weak to effectively puncture human skin, and even if successful, the bite produces minimal localized irritation.
Safety Recommendations
No safety measures are strictly necessary as they are completely harmless. If relocation is desired, gently cup the spider inside a container and release it outdoors or in an outbuilding.
Habitat & Behavior
Habitat & Range
Cosmopolitan distribution worldwide, heavily associated with human habitations, particularly damp basements, crawlspaces, garages, and indoor room corners.
Behavior & Temperament
Dull and sedentary hunters, entirely non-aggressive toward humans. When threatened, they engage in a rapid bouncing or whirling defense mechanism in their webs.
Diet & Prey
Insects and other spiders, famously including larger and potentially dangerous spiders like widow spiders, which they subdue by wrapping them rapidly with silk from a safe distance.
Seasonal Activity
Active indoors year-round due to temperature-controlled environments, though breeding activity often peaks during warmer spring and summer months.
Description
The long-bodied cellar spider is a familiar and harmless indoor resident easily recognized by its exceptionally long, delicate legs and tiny cylindrical body. Often found dangling upside down in corners or basements, this species is a master pest controller, quietly hunting down household insects and even other spiders.
Key Features
Extremely long and thread-like legs, an elongated, cylindrical greyish-tan abdomen, and the distinct habit of vibrating violently when disturbed.
Similar Species
Harvestmen (Order Opiliones), which are not true spiders and lack a divided body and silk glands; and crane flies (Order Diptera), which possess wings.
Life Cycle
Females carry eggs in a loose silk cluster held directly in their jaws rather than spinning a traditional stationary egg sac. Spiderlings undergo multiple molts to reach maturity and can live for several years.
Ecological Importance
Acts as an effective natural pest control agent inside homes and buildings, helping suppress populations of mosquitoes, flies, and other nuisance insects.
Conservation Status
Not evaluated by the IUCN, but populations are secure, abundant, and widely distributed globally alongside human settlements.
Interesting Facts
Despite the persistent urban legend that they possess the most potent venom of any spider, scientific research has proven their venom is actually quite weak against humans and vertebrates.
Photography Tips
Use macro settings with a stable tripod or steady hand, focusing on the distinct eye arrangement and slender body proportions under soft, diffused lighting.
Identified: 2026-10-08T15:04:57.240353