bdelloid

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

所有轮都是雌，而且牠们不需要精子就可以产生胚胎。

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.

就拿海洋中微小动物轮来说，大部份轮行有生殖，但是轮已经把丢开约一亿年了。