bdelloid

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

所有的形轮都是雌性，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.

就拿海洋中的微小形轮来说，轮行有性生殖，但是形轮已经把性丢开约一亿年了。