Characters: Colonies are massive. Corallites are circular and closely compacted in shallow water, more widely spaced in deeper water. Septa are fine, numerous and regular. Paliform lobes are usually poorly developed.
Colour: Pale grey, green or brown, usually with calices of contrasting colours.
Habitat: All reef environments.
Abundance: Very common, especially in high latitudes.
Identification Guides: Veron (1986a); Sheppard and Sheppard (1991); Nishihira and Veron (1995); Coles (1996); Carpenter, Harrison, Hodgson et al. (1997); Pillay, Terashima, Venkatasami et al. (2002); Chan, Choi, McCorry et al. (2005); Turak and DeVantier (2011b);