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A many-armed, orange starfish.

A Sea Star's Many Arms

An orange brisingid sea star sits on a large reef of Lophelia pertusa, cold-water corals in the Gulf of Mexico, at 450 m depth as a school of fish swims above. They have many arms—up to 20!—covered in spines, which themselves are covered with small snapping jaws called pedicellariae.

 

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At Smithsonian Ocean, we have lesson plans, activities, and resources to help you engage your students in the wonders of our oceans.