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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