Characters: Polyps are circular, up to 300 millimetres diameter and not heavily calcified, with a strong central arch. Septa are straight and have very large teeth and a prominent tentacular lobe. Costae are compact, with large branching spines of different sizes on different orders. The undersurface has pits between the costae but few deep perforations.
Colour: Usually brown, sometimes mottled, with pale septal margins and tentacular lobes.
Habitat: Reef slopes and lagoons.
Source reference: Veron (2000). Taxonomic reference: Veron and Pichon (1980). Additional identification guides: Veron (1986), Sheppard and Sheppard (1991), Nishihira and Veron (1995).