Coelastrea aspera

Coelastrea aspera is a species of stony coral found in the Indo-Pacific region. This coral is known for its colonial nature, forming either encrusting or massive colonies. The surface of Coelastrea aspera has a distinctive honeycomb-like appearance due to its cerioid arrangement of corallites, which are deep and angular with thick, straight walls. The coral typically exhibits a pale brown color, with oral discs that may contrast in cream shades. In some environments, the color can vary to dull green or grey, with bright green centers. This coral inhabits shallow waters, typically found on reef flats, slopes, and lagoons at depths up to about 15 meters, although it can be found as deep as 40 meters. Coelastrea aspera is a zooxanthelate coral, meaning it contains symbiotic photosynthetic organisms that provide it with nutrients and energy. It is a simultaneous hermaphrodite, releasing packets of eggs and sperm into the water column for cross-fertilization. Interestingly, some colonies brood eggs and larvae within the maternal polyps, showcasing a versatile reproductive strategy. Divers encountering Coelastrea aspera may observe its colonies forming level expanses on intertidal flat rocks. The coral is rated as Least Concern by the IUCN. During dives, the coral may exhibit different sizes of paliform lobes depending on its exposure to environmental conditions.