属于水生珊瑚虫类的多种集群海生水螅虫的任何一种，其有石灰石结构，类似真正的珊瑚。
Any of various colonial Marine hydrozoans of the order Hydrocorallinae, having a limestone skeleton and thus resembling the true corals.
薰衣草颜色的裸鳃以斐济Vatu-i-Ra附近的水螅虫作为饲料，与海蛞蝓有关的裸鳃是一种无壳的软体动物，可显示自然界里随处可见的一些最鲜明的色彩。
A lavender-colored nudibranch feeds on hydroids near Vatu-i-Ra, Fiji. Related to sea slugs, nudibranchs are shell-less mollusks that display some of the most vibrant colors found anywhere in nature.
其实珊瑚一词所指的动物甚多，包括大多数属珊瑚虫纲及数动属水螅虫纲的刺胞动物。
Actually, the term coral is much broader and refers to most of the animals in the class Hydrozoa of the Phylum Cnidaria.
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