rotifer

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

所有的蛭形轮虫都是雌性，而且们不需要精子就可以产生胚。

Competition between the rotifer Brachionus calyciflorus and the cladoceran moina macrocopa in relation to algal food concentration and initial rotifer population density.

和食物浓对三品系萼花臂尾轮虫实验种群动态的影响。

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虫来说，大部份轮虫行有性生殖，但是蛭形轮虫已经把性丢开约一亿年了。