What the coral?

This beautiful coral was photographed last Sunday and it was pointed out by one of the participant divers, Han - Thanks Han!



Initially, I thought this coral was Pectinia but I wasn't sure, and was a little confused by its colouration. So I enquired with the NUS marine researchers and they think it's Echinophyllia, but they also informed me that the only way to do a positive ID is to get a section of the skeleton, as it could also be Oxypora. Apparently the two corals are similar in appearance, but differ in morphology. I also learnt that colouration is not factored into the identification of coral.