Nagaibogumo (long-tailed spider) - Nagaibogumo (English spelling) two-tailed spider

Japanese: ナガイボグモ(長疣蜘蛛) - ナガイボグモ（英語表記）two‐tailed spider

A spider of the family Acanthidae. Females are 10mm long, males 7mm long. The body is flat, with gray-white vertical stripes on a dark gray background. It is found in Okinawa, Taiwan, southern China, and India, and lives in forests. It is difficult to find it when it is clinging to a tree trunk because it looks very similar to the bark of a tree. Its legs are thin and long compared to its body, but the third walking leg is extremely small. Both its Japanese and English names are probably due to the fact that it has a thread wart that is the same length as its body. It stands still on a tree trunk with its eight walking legs spread out in all directions, waiting for food to come. When an insect or other insect comes near it, it lifts its hips to watch, and when the insect stands still, it steps back one step at a time, and when it reaches the back of the trunk where it is out of sight of the insect, it shoots a sticky thread at the insect while shaking its long thread wart.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

ナガイボクモ科のクモ。体長は雌10mm，雄7mm。体は扁平で暗灰色の地に灰白色の縦斑がある。沖縄，台湾，中国南部からインドまで分布し，林間にすむ。木肌によく似ているので，樹幹にへばりついていると，さがすのが困難。脚は体に比べて細く長いが第3歩脚は極端に小さい。和名，英名ともに体長に等しい長さの糸疣（しゆう）をもっているためと思われる。8本の歩脚を四方に広げて樹幹に静止し餌のくるのを待ち，そばに昆虫などがくると，腰を浮かしてようすをうかがい，昆虫が静止すると一歩一歩後ずさりをし，昆虫から見えなくなる幹の後側まで下がると，長い糸疣をふりながら粘る糸をぴゅっと昆虫めがけて飛ばす。

出典　株式会社平凡社世界大百科事典第２版について　情報

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