Very special thanks for the first photo of Facia lacuna to Stefan Ogden from Oslo, he took the picture in Egypt, Al Bahr al Ahmar on the 3rd of August 2011.
This species occurs in the Red Sea, Kenya, Tanzania and Seychelles.
Colonies are submassive to massive, usually more than one metre across. Corallites are subplocoid, circular to irregular in shape, and crowded. The inner walls of corallites plunge vertically. Septa are thin, uniformly spaced and subequal, most reaching the columella deep within the calice. Costae of adjacent corallites do not meet, leaving a narrow ambulacral groove. There are no paliform lobes. Columellae are small and compact.
Colour: Tan with white centres.
Habitat: Shallow exposed reef environments.
Source: Corals of the World by Charlie Veron
Favia lacuna Veron, Turak & DeVantier, 2000 (original combination, basionym)