Crinoids

Crinoids

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Credit: GEORGETTE DOUWMA/SCIENCE PHOTO LIBRARY

Caption: Crinoids (class Crinoidia) on corals. Crinoids, are primitive echinoderms, relatives of starfish and sea urchins. They feed by filtering food particles from the water using their feathery arms, the hairs of which pass them to a central mouth. Crinoids first appeared during the Ordovician era, between around 488 and 443 million years ago, and they have changed little since. They are found in many seas and oceans, from shallow waters down to the deepest parts of the oceans.

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Keywords: animal, arm, arms, biological, biology, coral, corals, crinoid, crinoids, echinoderm, fauna, invertebrates, marine, marine biology, nature, tropical, underwater, wildlife, zoological, zoology

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