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Sea urchins (sea apples, sea urchins; class Echinoidea) are spiny, invertebrate animals that belong to the phylum echinoderms (Echinodermata).There are app. 900 different kinds. Sea urchins are usually more or less spherical, heart-shaped or disc-shaped and have an inferior mouth. They have a hard shell that is usually covered with spines. The shell consis...