comatulid

also co·mat·u·la (-lə)
n., pl., -lids, also -lae (-lē).
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.

[From New Latin Comātulidae, former family name, from Late Latin comātulus, having neatly curled hair, from Latin comātus, having long hair. See comate¹.]

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The noun has one meaning:

Meaning #1: free-swimming stalkless crinoid with ten feathery arms; found on muddy sea bottoms
  Synonym: feather star

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