bdelloid

1.All bdelloid rotifers are female, and they make embryos without any need for sperm.

所有的蛭形轮都是雌性，而不需要精子就可以产生胚胎。

2.Take a lineage of microscopic marine animals known as bdelloid rotifers.Most rotifers reproduce sexually, but bdelloid rotifers abandoned sex about 100 million years ago.

就拿海洋中的微小动物蛭形轮来说，大部份轮行有性生殖，但是蛭形轮已经把性丢开约了。