GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY
Luzon starfish (Echinaster luzonicus) on a coral reef. Starfish, also known as sea stars, are a type of marine invertebrate known as echinoderms. This species nearly always has six or even seven arms, as opposed to the usual five for similar species. Starfish use the tube-like feet on their underside to move across the seabed. They can be predators, plant-eaters or scavengers. Photographed off Papua New Guinea.
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