Characters: Polyps consist of fan-shaped segments up to 40 millimetres wide. Thick beaded septa are of unequal height. Polyps are commonly inflated with water to several times the volume of the skeleton.
Colour: Cream or brown, sometimes mottled.
Similar species: Diaseris fragilis, which is larger with thinner margins and has septa of uniform height.
Habitat: Soft substrates, especially where exposed to currents. Sometimes found in seagrass beds.
Abundance: Uncommon, but may be plentiful where it occurs.
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