bdelloid

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

所有的蛭形轮都是雌，而且牠们不需要精子就可以产胚胎。

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.

就拿的微小动物蛭形轮来说，大部份轮行有殖，但是蛭形轮已经把丢开约一亿年了。