Photo of Animalia: species: Dipsastraea lizardensis (Lizard Island Field Guide)

Dipsastraea lizardensis near Casuarina Beach, Lizard Island, at dusk with polyps expanded.

© Anne Hoggett

Photo identified by Grace Frank, who says that polyps out makes id tricky but this colony is the right colour and has circular corallites with neat septae so she's fairly sure of the id.