bdelloid

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

所有的形轮都雌性，而且牠们不需要精子可以产生。

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.

拿海洋中的微小动物形轮来说，大部份轮行有性生殖，形轮已经把性丢开约一亿年了。