D. ROBERTS / SCIENCE PHOTO LIBRARY D. ROBERTS / SCIENCE PHOTO LIBRARY
Starfish. X-ray of a starfish (phylum: Echino-dermata), seen in ventral view. Starfish live exclusively in the marine environment. So-called because of their star-shape, they typically have five arms projecting from a central disc. At the centre is the mouth. Skeletal plates occur along the edges of the arms to form a hard protective coat. As is visible here, there are grooves along the underside of the arms which contain small podia (suction feet) by which the starfish moves. Most starfish are scavengers and carnivores and feed on marine snails, bivalves, even fish.
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