Colonies are hemispherical to flat. Valleys average 20-25 millimetres wide, and are irregularly meandroid, becoming straight in flat colonies. Walls have a moderately thick fleshy appearance and usually have a groove along the top.
A wide range of red, grey and green, with valleys and walls usually of contrasting colours. Red Sea colonies are usually cream.
Upper reef slopes and fringing reefs.
Source reference: Veron (2000). Taxonomic references: Chevalier (1975), Veron and Pichon (1980). Additional identification guides: Veron (1986), Sheppard and Sheppard (1991), Nishihira and Veron (1995), Coles (1996).
displaying probable distribution of species. Points indicate recorded sightings from OBIS.
Symphyllia radians.Philippines.This species forms hemispherical or flat colonies with relatively straight valleys.Charlie Veron.
Symphyllia radians.Indonesia.Variation in valley colour and structure.Roger Steene.
Symphyllia radians.Great Barrier Reef, Australia.This species forms hemispherical or flat colonies with relatively straight valleys.Ed Lovell.
Symphyllia radians.Great Barrier Reef, Australia.This species forms hemispherical or flat colonies with relatively straight valleys.Mary Stafford-Smith.
Symphyllia radians.Great Barrier Reef, Australia.Variation in valley colour and structure.Neville Coleman.
Symphyllia radians.Papua New Guinea.Variation in valley colour and structure.Neville Coleman.