Characters: Colonies are flat and encrusting. Corallites are circular, uniformly spaced and separated by blistery coenosteum. Walls are thin. Septa are well developed, thin and straight. The inner margins of septa form a columella tangle. The colony surface is covered by a mass of slightly extended tentacles.
Colour: Pale brown.
Similar Species: Galaxea species. See also Oculina and Madracis.
Habitat: Shallow reef environments.
Abundance: Previously known from a single beach eroded specimen.
Taxonomic Note: The type species of Simplastrea Umbgrove, 1939. A very distinct species, taxonomically isolated and little-studied, and with no clear affinities. This is one of the rarest of all corals.
Taxonomic References: Veron (2000a);
