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.

• 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。