Check out Madracis sp. VERY similar to Stylocoeniella, but lacks the spiny developments around the polyps. This is given as a distinguishing characteristic in Julian Sprung's book Corals.
I was sold a gorgeous piece a while back as Madracis, but it has the spiny projections in the coenosteum, so I assume it is actually Stylo. I'd show a picture, but these are, of course, an sps and it's hard to capture this detail without a macro lens. Neat corals, nonetheless, and apparently quite rare in the hobby.