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Explore Shaped Echinoderms, Echinoderms Belonging and more!

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.

Crinoid (Promachocrinus kerguelensis), primitive relative of sea stars, highly mobile, mouth is located within the center of the ring of arms, Antarctica; photo by Norbert Wu.

Feather star (Crinoidea) are primarily nocturnal but they are seen in the open during the day with their arms rolled up. Jim Lyle

Sea stars are among the most impressive and famous marine animals. Despite its name, the starfish is not a fish; it’s an echinoderm, closely related to sea urchins and sand dollars...

Look for more hearts in the white bump patterns on starfish itself