Any of various marine invertebrates of the class Crinoidea,such as the sea lilies and feather stars,that are attached to a surface by a stalk when young but may be free - swimming as adults.
英
美
释义
海羊齿一种海百合类海洋生无脊椎动物,如带柄海百合及毛头星,幼年时漂浮,成年时可自由游动。
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