Cellar Spider

Pholcus phalangioides — the long-bodied cellar spider, also called the daddy long-legs spider — is one of about 1,800 species in family Pholcidae. The species is among the most common indoor spiders in temperate homes worldwide, recognized by the small body, extraordinarily long thin legs, and tendency to vibrate the loose, irregular web rapidly when disturbed (a defensive behavior that blurs the spider's outline against approaching predators). Cellar spiders are araneophagic — they actively hunt and kill OTHER spiders — and they are documented to kill even venomous house spiders including black widows (Latrodectus), brown recluses (Loxosceles), and large house spiders (Tegenaria). The hunt strategy: cellar spider invades the prey spider's web, mimics struggling-prey vibrations, lures the resident in, then quickly throws sticky silk over the resident's legs from a safe distance, immobilizing it before delivering the bite. The persistent internet myth that cellar spiders have 'the world's deadliest venom but fangs too short to bite humans' is false on both counts: the venom is mild and rapidly hydrolyzed in mammalian tissue, and the fangs CAN briefly puncture human skin, producing a sensation roughly comparable to a mosquito bite. The species is widely encouraged as a beneficial indoor predator.