Polyps have an irregular outline, flat to strongly convex, thin and light. Septa are of markedly different sizes and have large pointed teeth. Tentacular lobes are weakly developed. Costae are widely spaced, the larger having simple spines. The undersurface has pits between the costae.
Pale brown often with pale septal margins and tentacular lobes.
Reef slopes and lagoons.
Common in the Red Sea and western Indian Ocean, uncommon elsewhere.