While other species of spider exhibit this behaviour, such behavior by the Pholcidae species has led to these spiders sometimes being called "vibrating spiders". It may oscillate in tune with the elasticity of the web causing an oscillation larger than the motion of the spider's legs. The arachnid responds by vibrating rapidly in a gyrating motion in its web, which may sometimes fall into a circular rhythm. Some species of Pholcidae exhibit a threat response when disturbed by a touch to the web or entangled large prey. When finished feeding they will clean the web by unhooking the remains of the prey and letting the carcass drop from the web. The prey may be eaten immediately or stored for later. When pholcid spiders detect prey within their webs the spiders quickly envelop prey with silk-like material. The web of pholcids has no adhesive properties and instead relies on its irregular structure to trap prey. Behavior Cellar spider vibrating rapidly in response to a threat Trapping In areas of human habitation pholcids construct webs in undisturbed areas in buildings such as high corners, attics and cellars, hence the common name "cellar spider". These webs are constructed in dark and damp recesses such as in caves, under rocks and loose bark, and in abandoned mammal burrows. Pholcids hang inverted in their messy and irregular-shaped webs. Pholcids are found in every continent in the world except Antarctica. However, harvestmen only have one pair of eyes and appear to have only one body segment. Harvestmen ( Opiliones), which are not spiders at all, also have long and thin legs (indeed, "daddy longlegs" is sometimes applied to that group as well). There is variation in size, ranging from just over 1 millimetre ( Spermophorides lascars) to 11 mm ( Artema atlanta) in body length. Pholcus, Holocnemus), long and pointed dorso-posteriorly (e.g. The opisthosoma may be long and cylindrical (e.g. Pholcus, Micropholcus) or have a furrow or pit in the middle. Like other spiders, pholcids have two body segments, the prosoma and opisthosoma. The body is often whitish or grey in colour. Modisimus, Spermophora, Spermophorides) lack this pair and have a total of six eyes. Most have this middle pair present for a total of eight eyes, but some genera (e.g. They can be distinguished from other long-legged spiders by the arrangement: Pholcidae have two groups of three eyes each, and there may be a pair of small eyes in between them. Pholcids have extremely long and thin legs with flexible tarsi. The common name "daddy long-legs" is used for several species, especially Pholcus phalangioides, but is also the common name for several other arthropod groups, including harvestmen and crane flies. The family, first described by Carl Ludwig Koch in 1850, is divided into 94 genera. The family contains more than 1,800 individual species of pholcids, including those commonly known as cellar spider, daddy long-legs spider, carpenter spider, daddy long-legger, vibrating spider, gyrating spider, long daddy, and skull spider. The Pholcidae are a family of araneomorph spiders. Close-up of a cellar spider's cephalothorax, showing two groups of three clustered eyes and a pair in between
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