Thin birdsnest coral - Seriatopora hystrix

"Seriatopora hystrix" is a species of colonial stony coral in the family Pocilloporidae. It forms a bushy clump and is commonly known as thin birdsnest coral. It grows in shallow water on fore-reef slopes or in sheltered lagoons, the type locality being the Red Sea. It is native to East Africa, the Red Sea and the western Indo-Pacific region.