迟眼蕈蚊蛹和成虫的雌雄鉴别

Sexing the pupae and adults of Bradysia sp.

提出了1种依据外观形态特征,迅速准确鉴别迟眼蕈蚊Bradysia sp.蛹和成虫雌雄性别的方法。雌蛹的第8腹节末端中央有2个大小相同并列排布的圆形突起;雄蛹第8腹节末端有呈三角形排布的3个圆形突起,其中中间的圆形突起较两边的圆形突起略小,区分较为明显。成虫雌性体积明显比雄性大,雄虫腹部末端宽大,有2个呈对称排布的抱握足,向内弯曲;雌虫腹部中部粗大,向端部渐细而尖,腹端具一阴道叉。准确区分雌雄性别对于了解迟眼蕈蚊田间性比,研究其生物学特性、种群动态及开展预测预报等具有重要应用价值。

A method for quickly and accurately sexing the pupae and adults of Bradysia sp. according to the morphological characteristics is described. There are two similar cone spikes on the 8th abdominal segment of the female pupae while there are three cone spikes on the 8th abdominal segment of the male pupae. The last section of male adult＇s abdomen has two clasping legs,bending inward,just like the clamps while the distal end of female＇s abdomen looks like the sharp of a tip. Sexing pupae and adults is essential to determine the sex ratio and important for population dynamics research and outbreak forecasting.