Characters: Colonies are submassive or laminar, up to 1.5 metres across. Valleys are 3-4 millimetres wide, usually perpendicular to colony margins, becoming sinuous towards the colony centre. Septa are irregular, with strong teeth. Columellae do not form centres and are not laminar. Colour: Pale blue-grey to translucent white. Similar species: Leptoria phrygia. See also the merulinids Scapophyllia cylindrica and Merulina ampliata. Habitat: Upper reef slopes. Abundance: Uncommon.