Characters: Colonies are large and hemispherical or encrusting. Valleys are usually long and sinuous but may become short, with 1-3 centres and form Hydnophora-like (Merulinidae) monticules. Septa are exsert, equal, and finely toothed. A fine ambulacral groove occurs along the tops of walls. Tentacles are extended only at night.
Colour: Walls are brown or grey with valleys the same colour or green.
Taxonomic note: Colonies with 1-3 centres have been considered by some authors to be a distinct species, Colpophyllia breviserialis. Source reference: Veron (2000). Taxonomic references: Roos (1971), Cairns (1982), Zlatarski and Estalella (1982), Fenner (1993). Additional identification guides: Colin (1978), Wood (1983), Humann (1993).