Brain Coral Colony

Diploria labyrinthiformis

Brain coral (Diploria labyrinthiformis), also known as grooved brain coral, is a massive reef-building coral that forms large, dome-shaped colonies reaching up to 2 meters in diameter. Its surface is covered with a complex pattern of meandering ridges and valleys that closely resemble the convolutions of a human brain, giving it its common name. The living tissue covers the entire colony surface, with individual polyps arranged along the valleys between ridges. During the day, the polyps are retracted and the colony appears as a solid stone-like structure. At night, polyps extend their tentacles to feed on zooplankton drifting in the current. Brain corals are among the slowest-growing corals, adding only a few millimeters per year, meaning large colonies may be several hundred years old. They are important reef framework builders in the Caribbean and western Atlantic, providing structural habitat for countless reef organisms. Their fluorescent pigments can create beautiful color displays under UV or blue light. Brain corals are relatively resilient compared to branching species but are still threatened by coral bleaching, ocean acidification, and disease.