Drosophila life cycle 25℃下果蝇 的生活史： Adult 成虫 Egg 蛹 卵 Pupa 31/2-41/2 days 1 day in pupal stage First instar larva 一龄幼虫 21/2-3 days 1 day 三龄幼虫 Third instar larva Second 上海文通大 1 day instar larva二龄幼虫 SHANGHAI JIAO TONG UNIVE25℃下果蝇 的生活史: