springtail

any of numerous minute wingless primitive insects possessing a special abdominal appendage that allows the characteristic nearly perpetual springing pattern; found in soil rich in organic debris or on the surface of snow or water

ほぼ絶え間なく飛び跳ねる特徴的な動作を可能にする特殊な腹部付属肢を持つ、多数の微小で原始的な無翅昆虫の総称；有機物の多い土壌中や雪面・水面に生息する