STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Starfish. Scanning electron micrograph of the underside of a starfish (class Asteroidea), showing the mouth (centre) and the ambulacral grooves running down the centre of each of the five arms. Each arm also has hundreds of podia, minute foot-like suckers, within the groove that allow the starfish to move on the seabed in any direction. At the end of each arm is a microscopic eye (not seen), which enables the starfish to see its prey. Starfish can choose to be predators, plant-eaters or scavengers, depending on their environment.
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