Commentaire : Corallum free-living. Each coral with usually one, centrally located mouth (monostomatous). They are discoidal, thin and usually flat but sometimes slightly arched or concave. The length of the central fossa, measured at its bottom, is 1/13 to 1/6 of the coral length. Maximum length of the coralla up to 15 cm. The septa are densely packed and straight. The solid septa of lower orders are thicker and more protruding than the partly perforated septa of higher orders. The septal margins are ornamented with fine, angular dentations. The corallum wall is solid and not granulated. The costae are unequal in size; those of lower orders usually grow relatively thick and exsert, those of higher order cycles remain smaller. The costae are ornamented with spines which vary from extremely echinose, long and directing in various directions to small and granular, or to smooth, blunt, and laterally flattened.
Protection : basse