Coarse bare ribbed coral is a species of animal in the bare ribbed coral genus of the bare ribbed coral family. The coral shell is branched, with short and wide branches that can merge with each other, and the top is a bifurcated fan-shaped structure. The valleys between the ridges on the surface of the non coral cup are discontinuous and shallow. There are flat pillars or protrusions on the pillars at the bottom of the valley. The spacer is slightly protruding, with primary and secondary spacers arranged alternately. The edges of the spacer have teeth, and there are particles on both sides. 6-9 spacers are connected to the shaft column, and they are pink yellow or rouge red in daily life. Distributed domestically in Hainan Island, China.