Characters: Colonies form flat, unifacial, explanate or encrusting plates, commonly arranged in whorls. Corallites are in concentric valleys. Centres are widely spaced (3-5 per cm). Long and short septo-costae clearly alternate.
Colour: Rust brown, usually with pale margins. Mouths are white and star-shaped, a useful identification aid.
Similar Species: Agaricia grahamae, which is usually distinguished by lack of white mouths, and septo-costae which do not alternate and are thicker than the spaces between them.
Habitat: Shallow reef environments.