Phymosomatoida
 The Phymosomatoida are an order of sea urchins found in Europe North America North Africa and the Middle East.They are distinguished from other sea urchins by the presence of large fused plates on top of the feeding lantern. The test is usually sculpted to some degree but unlike their close relatives the Temnopleuroida the tubercles are never perforated. The opening in the test through which the anus passes known as the periproct is unusually large in sea urchins from this group.