This species is thought to be a hybrid between M. decactis and M. formosa (ref below).

Colonies consist of thick, compact branches. Calices have 10 primary septa (like M. decactis) but this species has a more branching colony structure (like M. formosa). Branches are stubby, oval or round in cross section.

They are brown overall, with greenish-yellow centres.

Vermeij MJA, Diekmann OE, Bak, RPM. (2003). A new species of scleractinian coral (Cnidaria, Anthozoa) Madracis carmabi n. sp. from the southern Caribbean. Bull.mar.Sci. 73: 679-684.