Characters: Colonies are flat to hemispherical and up to 2 metres across. They have tusk-like, elongate, closely compacted monocentric corallites. Individual corallites unite only at the base of the colony. Primary septa are very exsert, with long teeth. The exsert primary septa have a spoke-like appearance underwater. Colour: Uniform grey. Similar species: Lobophyllia corymbosa, which lacks the spoke-like appearance of septa and has a wide range of colours. See also L. hemprichii. Habitat: Upper reef slopes and lagoons. Abundance: Uncommon