hermatypic

hermatypic Normally refers to reef-building corals.

通常指会瑚。

Reef-building or hermatypic corals are only found in the photic zone (above 50 m depth), the depth to which sufficient sunlight penetrates the water for photosynthesis to occur.

大多数石瑚必须在大洋透光层（水深不到50米）中生长，这里瑚内部共生单细胞虫黄藻能够进行光合作用。