Polyps are solitary, free-living (except for juveniles) and flat, with a central mouth. Septa have large lobed teeth. Polyps are among the largest of all corals. Tentacles are extended day and night and are long, similar to those of giant anemones. There is one mouth up to 30 millimetres wide.
Pale or dark blue-green or grey tentacles with white or pink tips. The oral disc is striped.
Usually found on flat soft or rubble substrates especially in reef lagoons or shallow turbid environments.
Heliofungia actiniformis.Papua New Guinea.Colour variations.Roger Steene.
Heliofungia actiniformis.Great Barrier Reef, Australia.The usual appearance of tentacles. These remain extended during the day and are very different from the tentacles of any Fungia.Mary Stafford-Smith.
Heliofungia actiniformis.Papua New Guinea.Underside of a polyp.Neville Coleman.