Cellar Spider

Pholcus phalangioides, commonly known as the cellar spider or daddy long-legs spider, belongs to the family Pholcidae. Adult body length ranges from 7–10 mm, with the characteristic extremely long, slender legs extending their span to an impressive 50–70 mm, making their overall appearance quite delicate. Females produce multiple egg sacs throughout their lifespan, each containing 20–60 eggs, which they meticulously hold and carry in their chelicerae until hatching. Development from egg to adult takes approximately 9–12 months, and individuals can live for 1–3 years, favoring environments with relatively stable temperatures between 15–25°C and moderate to high humidity (60–80% RH).

Cellar spiders exhibit a primarily nocturnal hunting strategy, though they remain active within their webs during the day. They are solitary creatures, showing no evidence of communal living or complex social structures. Their dispersal is typically passive, often carried by air currents or inadvertently introduced by human activity, rather than active long-distance migration. When disturbed or threatened, they display a unique defensive vibration behavior, rapidly gyrating their bodies within their web to create a visual blur, an effective tactic to confuse predators and obscure their exact location. Their predatory diet is broad, including various insects and other spiders, even medically significant species like black widows (Latrodectus spp.) and brown recluse spiders (Loxosceles reclusa), which they skillfully incapacitate with their silk before envenomation.