Peter. Thanks for taking the time to display a FTS for everyone, very nice.
I will take the time to expand on my answer/comment, in regards to your earlier question, about identification between Isis hippuris and your Rumphella ...
Members of the genus Isis can be identified by, quite distinctive, alternating black/white segments of the axial skeleton.
Individuals of the genus Isis and the common Indo-Pacific zooxanthellate genus Rumphella are often confused with one another. However, the aforementioned segemented axial skeleton of the Isis species, among other distinguishing characteristics, easily separates them.