planulae
1. invaginate planula
[医] 原肠胚
2. 7.Fertilization is external, producing free-living planula larva.
体外受精,能产生自由活动的浮浪幼虫。
3. In the adult, or medusa stage of a jellyfish, they can reproduce sexually by releasing sperm and eggs into the water, forming a planula.
在海蜇成体或水母体阶段,它们通过将精子和卵于释放到水中形成浮浪幼体而进行有性繁殖。