good resource for ID'ing the different Acanthastrea?

[greystreet41]

I've yet to get a confident ID on this guy. I've heard echinata, hillae, and bowerbanki..chime in if you have a clue.

 

[edwar050]

Not sure but that is one nice looking acan and must look wicked under actinic-

 

[cee]

Have you tried here, here, or here? I'd probably elimate echinata off the list due to the lack of concentric folds of tissue, but the other two are valid considerations.

Dave