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Liphistiidae
The spider family Liphistiidae comprises 8 genera and about 100 species from Southeast Asia, China, and Japan. They are among the most basal living spiders, belonging to the suborder Mesothelae. In Japan, the kimura-gumo (''Heptathela kimurai'') is rather well-known.
==Biology==
Liphistiidae are rarely seen, tube-dwelling spiders that construct rudimentary trap-doors, characterized by their downward pointing, daggerlike chelicerae,〔Haupt 2004〕 and by having a segmented series of plates on the upper surface of their abdomens. Some make silk trip-lines radiating away from the burrow entrance. They are active at night and live for many years, and females molt after maturity. Adult males wander in search for females, which rarely leave their burrows. The respiratory system consists only of book lungs, which could be a reason why these spiders show a quite low level of activity.〔Coddington & Levi 1991〕 In the past they were frequently believed to lack venom entirely, but in 2010 it was shown that at least ''Liphistius'' do have venom glands.
Although most species live in burrows, cave-dwelling species also fasten their retreats to the cave walls. Both burrows and retreats are sealed with woven doors.〔Murphy & Murphy 2000〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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