这两个纲的许多种类都有水母型和水螅型的世代交替。
The two key link in many types of jellyfish are generational-type and Hydra type.
水螅型珊瑚虫，水螅虫一种有柱状身体和通常被触角包围的口部开口的腔肠动物，比如水螅或珊瑚虫。
A coelenterate, such AS a hydra or coral, having a cylindrical body and an oral opening usually surrounded by tentacles.
水螅型珊瑚虫，水螅虫一种有柱状身体和通常被触角包围的口部开口的腔肠动物，比如水螅或珊瑚虫。
A coelenterate, such AS a hydra or coral, having a cylindrical body and an oral opening usually surrounded by tentacles.
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