Name: Red Sea Urchin
Information: A Sea Urchin's spherical body is completely covered by sharp spines that can grow up to 8 cm. These spines grow on a hard shell called the "test", which encloses the animal. The oldest ones have been measured to be around 19 cm in diameter. It can vary in colour from red to dark burgundy. A sea urchin has no visible eyes or legs. It has a mouth located on its underside, which is surrounded by 5 teeth. During development, the Sea Urchin transforms itself from radial to bilateral symmetry, and then again from bilateral to radial. It crawls very slowly over the sea bottom using its spines as stilts, with the help of its tube feet. Scattered among its spines are rows of tiny tube feet with suckers that help it to move and stick to the sea floor.