tracheal gill

One of the external filaments or leaflike plates connected with the tracheae of the inside of the body that form part of the respiratory system of some aquatic insect larvae and nymphs but rarely persist in the adult.

一部の水生昆虫の幼虫や若虫の呼吸器官の一部を形成する、体内の気管と連結した外付けの糸状突起または葉状の板（成虫に残ることは稀）