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The tube-dwelling spiders (family ''Segestriidae'') consist of two large and widespread genera (''Segestria'' and ''Ariadna'') and two smaller genera, ''Citharoceps'' and ''Gippsicola''. The family is easily recognized because its members have six eyes (most spiders have eight) arranged in a semicircle and have the first three pairs of legs arranged forward (most spiders have only the first two pairs so arranged.) The leg structure appears to be an adaptation for living in silken tubes, which unlike those of the atypical tarantulas, may branch and are often built in tree bark fissures, as well as under stones. These are haplogyne primitive araneomorphs related to the Dysderidae, being placed in clade or superfamily Dysderoidea. Both ''Segestria'' and ''Ariadna'' are known from North America, South America, Eurasia, Africa and New Zealand, while ''Ariadna'' is also known from Australia. This wide distribution attests to the ancient origin of this family. ==Genera== , the World Spider Catalog accepts the following genera: * ''Ariadna'' Audouin, 1826 – America, Africa, Asia, Australia * ''Citharoceps'' Chamberlin, 1924 – USA, Mexico * ''Gippsicola'' Hogg, 1900 – Australia * ''Segestria'' Latreille, 1804 – Palearctic, Americas, New Zealand, Central Asia 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Tube-dwelling spider」の詳細全文を読む スポンサード リンク
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