Octocorals are most commonly known as large colorful sea-fans. They have eight pinnate tentacles on each polyp rather than six on other corals. They can grow far deeper than other corals.
图为八放珊瑚。顾名思义,个头偏大、五光十色的它们在每个珊瑚虫上长有八只羽状触角,而通常的珊瑚只有六只。比起其他珊瑚,他们生活在更深的海底。