No alternation of generations the medusoid phase being entirely suppressed: sea anemones; corals.
由于没有世代交替，水母阶段遭到完全抑制；海葵；珊瑚虫。
2
Coelenterates typically having alternation of generations; hydroid phase is usually colonial giving rise to the medusoid phase by budding: hydras and jellyfishes.
以世代交替为特色的腔肠动物；通常群居的水螅阶段先于水母阶段；水螅和水母。
3
When set free in a container of seawater, the muscles could be jolted into action with a small electric charge to produce synchronised contractions, allowing Medusoid to swim.