Brittle star

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phylum Echinodermata The Ophiurida is an order of echinoderms within the class Ophiuroidea. It includes the vast majority of living brittle stars. Most have five arms which they move side to side by means of ball-and-socket joints. The digestive glands are entirely within the central disc. Distribution is world wide in oceans at various depths. Most brittle stars are herbivores or detritus feeders.

For more information see the Wikipedia entry.

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subphylum Asterozoa
class Ophiuroidea
order Ophiurida