There is a Plerogyra species, P. discus, that is very similar to Nemenzophyllia turbida. The differences between the the two species lie within "corallite" (not sure correct term for "wall") and mantle size (smaller in N. turbida), and exert septa in P. discus. Based on polyp morphology, the two species should probably be placed in the same genus, although molecular studies on this family have failed to turn up any specimens for P. discus.
In addition to the three Blastomussa species imported in the trade (B. merletti, B. wellsi, B. vivida), there are two other species (B. omanensis & B. loyae), found in the Indian Ocean. Both are subplocoid to cerioid, and B. omanensis is found in the Central Indian Ocean, while B. loyae is found in the Red Sea. From what I can see, B. loyae is similar to B. merletti and B. omanensis is similar to B. wellsi.
In addition to the three Blastomussa species imported in the trade (B. merletti, B. wellsi, B. vivida), there are two other species (B. omanensis & B. loyae), found in the Indian Ocean. Both are subplocoid to cerioid, and B. omanensis is found in the Central Indian Ocean, while B. loyae is found in the Red Sea. From what I can see, B. loyae is similar to B. merletti and B. omanensis is similar to B. wellsi.
I'm a senior myself.

