Any of numerous crinoids of the genus Antedon and related genera, having a free-swimming, stalkless adult stage with branched, feathery arms.

• 毛头星，海羊齿：一种海羊齿属海百合及其亲缘种属植物之一，在其能自由浮游的无柄的成熟阶段，生有多枝的，羽状的手臂