Crinoidea

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Also known as Crinoids. Diet: Most species are nocturnal filter feeders consuming plankton and decaying organic matter. To feed they spread their feeding arms to sieve the passing sea water for microscopic organisms and detritus.
Max. Size: In living crinoids, the arms range in size from 0.39 to 13.8 in (1 to 35 cm), depending on the species.
Fun Fact: Members of the class Crinoidea are gonochoric. During spawning, the pinnule walls rupture and the eggs and sperms are shed into the seawater. Life cycle: Embryos elongate into free-swimming larvae (doliolaria) which later sink to the bottom where they metamorphose into stalked sessile crinoid.

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