Any of numerous characteristically colonial hydrozoan coelenterates having a polyp rather than a medusoid form as the dominant stage of the life cycle.
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美
- 水螅虫许多典型的移居的腔肠动物中水螅虫类的任何一种,在生命循环中最重要阶段以水螅的形状而不是水母的形状出现