corals Rock formation consisting of the calcareous skeletons of certain coelenterates (especially stony corals) coralline algae, mollusks, certain sponges (sclerosponges), and/or other organisms.

• 珊瑚固著性群居的腔肠动物,具有石灰质骨骼,部份种类会与藻类共生,石灰质骨骼会累积形成岩石甚至岛屿。