Add Yahoo as a preferred source to see more of our stories on Google. A close-up view of a vibrant red starfish arm underwater, showing small tube feet extending from its textured surface.© A-Z ...
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Starfish are also known as asteroids because they form the taxonomic class Asteroidea (/ ˌæstəˈrɔɪdiə /). About 1,900 species of starfish live on the seabed, and are found in all the world's oceans, from warm, tropical zones to frigid, polar regions.
Starfish, also called sea stars, are echinoderms that constitute the class Asteroidea. As their name suggests, they have a characteristically star-like body, with most species having five arms radiating from a central disc (pentaradial symmetry).
Starfish (or sea stars) are beautiful marine animals found in a variety of colors, shapes, and sizes. All starfish resemble stars, and though the most common have only five arms, some of these animals can grow up to 40 arms.
Discover amazing starfish facts — their anatomy, regeneration, species, diet, habitat, and role in ocean ecosystems worldwide.
For other echinoderms of similar name, see brittle star; feather star. For a species of special interest, see crown-of-thorns starfish. This article was most recently revised and updated by John P. Rafferty.