Jumping spider (fly tiger) - Jumping spider (English spelling)

Japanese: ハエトリグモ(蠅虎) - ハエトリグモ（英語表記）jumping spider

A general term for spiders in the family Salticidae in the order Araneae. The name "jumping spider" comes from their skillful catching of flies, while their English and Chinese names "jumping spider" come from their agile jumping motion. There are about 5,000 known species worldwide, and although they are common in tropical and subtropical regions, they are widely distributed around the world. Large species are just over 20 mm long, while small species are just under 2 mm long. The ends of their walking legs are densely hairy, which is well adapted to their wandering and jumping motions. This group of spiders is highly visually dependent in their behavior, with eight simple eyes arranged in three rows, with the four eyes in the front row facing forward and the two eyes in the third row facing diagonally upwards being large, and the two eyes in the center of the front row being the largest of the eight eyes.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

クモ目ハエトリグモ科Salticidaeの蛛形（ちゆけい）類の総称。ハエトリグモの名は巧みにハエをとらえる行動に，また英名や中国名の跳蛛はその敏しょうな跳躍動作に由来する。世界中で約5000種ほどが知られており，熱帯･亜熱帯地域に多いが全世界に広く分布しているグループで，大型種は20mm余り，小型種は2mm弱。歩脚末端には毛が密に生え徘徊（はいかい）･跳躍行動によく適応している。クモの中では高度に視覚に依存した行動をとるグループで，8個の単眼は3列に並び前方を向いた最前列の4眼と斜上方を向いた第3列の2眼は大きく，とくに最前列中央の2眼は8眼中最大となる。

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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