notonectid

例句：

1. 1.The notonectid is a rare and endangered species.
   这个物种是稀有且濒临灭绝的。
2. 2.The notonectid has been extinct for over 500 million years.
   这个物种已经绝迹超过5亿年了。
3. 3. The notonectid is found only in a few small lakes in the Amazon rainforest.
   这种生物只在亚马逊雨林中的几个小湖中被发现。