Dipsastraea speciosa
Dipsastraea speciosa (previously called Favia speciosa) is a species of colonial stony coral in the family Merulinidae. It is found in tropical waters of the Indian and Pacific oceans. Dipsastraea speciosa has rounded to very elongated corallites, with diameters of 10 to 15 mm. The corallites are separated by broad walls, with a distance of 3 to 6 mm between individual corallites. This species can be distinguished from the more common Dipsastraea pallida, with which it has often been confused, by its septa, which are fine, numerous, and regularly spaced. Both the septa and costae have fine, evenly spaced teeth. Colonies of Dipsastraea speciosa are massive in their growth habit. The corallites are crowded together, subcircular, with calices up to 12 mm in diameter. Their coloration ranges, including pale grey, green or brown, usually with calices of contrasting color. Colonies of Dipsastraea speciosa tend to be massive.
It is a tropical coral found in all shallow, tropical reef environments in the Indian and Pacific Oceans. It can be found at depths ranging from 0 to 40m. It can be found in all reef environments, sub-tidal on rocks, rocky reefs, outer reef channels, black and fore-slopes and in lagoons. Dipsastraea speciosa prefers waters ranging from 23° to 29 °C but can tolerate temperatures slightly above and below. Like most other corals, they contain photosynthetic algae, called zooxanthellae. Dipsastraea speciosa and the algae have a mutualistic relationship. The algae live within the coral polyps and use sunlight to make energy. The coral provides protection and the compounds needed for photosynthesis. In return, the algae produce oxygen and help the coral to remove waste. Most importantly, the zooxanthellae supply the coral with glucose, glycerol and amino acids. The coral then uses these to make proteins, fats, and carbohydrates which help produce their calcium carbonate skeleton.
The relationship between the zooxanthellae and the coral polyp creates a tight recycling of nutrients in nutrient-poor tropical waters and is the driving force behind the growth and productivity of the reef. In addition, corals also eat through filter feeding. At night, coral polyps come out of their skeletons to feed, stretching their nematocysts to capture plankton floating by. The prey is then pulled into the polyps’ mouths and digested in their stomach cavity.
(extract from Wikipedia)
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