A solitary, sometimes colonial, coral, with open branched or adjoined corallites. The calice is shallow with long septa, sometimes reaching the centre of the corallite. Dissepiments are numerous, small, well-rounded, and confined to the outer zone of corallite. The central zone is occupied by flat or slightly curved tabulae. The external walls are thin with fine growth ridges.
Habitat : Heliophylllum inhabited shallow water.
Distribution : Worldwide, except Asia
Age : 300 - 400 million yeara ago