n. asteroidea ; stelleroidea
海星纲起着重要的生态作用。
同为海百合纲的海羽星是一种高度灵活的海星形式。
This species, also known as crinoids, is a highly mobile form of sea star.
arm一词亦指无脊椎动物的附肢或运动器官，如海星的腕、章鱼的触手和腕足纲动物的腕足。
The term may also denote the limb or the locomotive or prehensile organ of an invertebrate (e. g. , the ray of a starfish or the tentacle of an octopus).
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