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Starfish or sea stars are echinoderms About 1,500 living species of starfish occur on the seabed in all the world's oceans, from the tropics to subzero polar waters.  They typically have a central disc and five arms, though some species have more than this. The aboral or upper surface may be smooth, granular or spiny, and is covered with overlapping plates.

Starfish or sea stars are echinoderms About 1,500 living species of starfish occur on the seabed in all the world's oceans, from the tropics to subzero polar waters. They typically have a central disc and five arms, though some species have more than this. The aboral or upper surface may be smooth, granular or spiny, and is covered with overlapping plates.