Featherstars on a reef. Featherstars, or crinoids, (class Crinoidea) are an ancient and primitive echinoderm, a member of the group of invertebrates that includes the starfish. They use their feathery and fragile arms to catch and convey microscopic plankton and detritus to their mouth, which is located at the base of the arms. Unlike the closely-related sea lily, a featherstar is a free- swimming animal.
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