Arrangements of eight and six eyes both occur in this family. Pholcus and Smeringopus have cylindrical abdomens and eyes arranged in two lateral groups of three and two smaller median contiguous eyes. The body, resembling the shape of a peanut, is approximately 2–10 mm (0.08–0.39 inch) in length, and the legs may be up to 50 mm (1.97 inches) long. Pholcids are thin and delicate arachnids. 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
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