Characters: Polyps are circular and flat, up to 200mm diameter, with a small central dome and upturned margins. Septa are in two or three irregular orders at the central dome and form three indistinct orders at the margins. There is a slight lobe at the commencement of septa. Septal serrations are fine. Costae are very fine and indistinct.
Colour: Brown.
Similar Species: Cycloseris vaughani, which has a smaller, thinner polyp disc without upturned margins. See also Fungia concinna.
Habitat: Lower reef slopes.
Abundance: Rare.
Taxonomic Note: This is the largest Cycloseris. Considered a synonym of Fungia spinifer (as Lithophyllon spinifer) by Hoeksema (2014). Apart from a size difference, the fusion of major septa with the formation of tentacular lobes is distinctive.
Taxonomic References: Veron (2000a);
