A type of simple invertebrate animal with radial symmetry and tentacles, including jellyfish, coral, and sea anemones. These animals have a body wall made of two layers and a central digestive cavity. In modern biology, these are often reclassified into [[刺胞动物|刺胞動物|ci4 bao1 dong4 wu4]] and [[栉水母动物|櫛水母動物|zhi4 shui3 mu3 dong4 wu4]].