说起虱子，那简直是农村人的噩梦，这玩意现在已经绝迹。 不知去了哪里，但是最近小编在湿地水塘里发现了一种动物，请看下图。
It's just lice, there are wood there, bug phobia please throw away the phone and float by gently.
其实它是湿地的一种底栖动物龙虱的幼虫，绝不是大家小时候身上长那种虱子哦
龙虱生活史的全部或大部分时间生活于水体底部，它作用非常大，是淡水生态系统的一个重要生态类群，它对于维持水生态系统功能的完整性有着至关重要的作用，是水生态环境质量的指示性物种。
Show you what I sampled guys
Dragon lice
Morphological characteristics: Aquatic beetles of the Coleoptera family, adults about 3 to 45 mm long, ovoid or long oviparous, slightly narrow anterior end, black or dark brown, adult hind feet developed, paddle-shaped, suitable for swimming.
The picture below is what it looks like after growing into an adult, and the difference between it and the larvae is still very large. Right.
Life characteristics: Dragon lice live in freshwater waters such as ponds, swamps and ditches with many aquatic plants. The stages of adults, larvae and pupae are all spent in water. Predators range from insects to fish larger than themselves. Adults have a strong phototropism, when swimming to the surface of the water, when there is a light, they fly high into the sky, tending to the light source.
The image comes from the Internet
Larval characteristics: Dragon lice larvae are mostly worm-like, with a well-developed and hard head. Chewable mouthpiece, large jaw developed, chest and feet. 9 or 11 segments of the abdomen.
Why do dragon lice carry bubbles
The dragon lice have no gills, and they breathe in the water by the bubbles they carry under their wing sheaths. The bubbles are wrapped around the outside of the stomata and function like gills, and oxygen enters the stomata through the bubbles when in water. As the proportion of oxygen in the bubble gradually decreases, the bubble becomes smaller and smaller, and finally, the dragon lice float to the surface of the water to replace the fresh air.