Characters: Colonies are usually columnar. The columns are club-shaped, sometimes divide, and are slightly flattened in section. Corallites are widely separated, circular in outline, with a solid conical columella. Eight primary septa are distinctive. The coenosteum has fine spinules.
Colour: Usually green with yellow oral discs.
Similar Species: Madracis decactis and M. mirabilis, both of which have 10 primary septa.
Habitat: Lower reef slopes protected from wave action.
Abundance: Uncommon.
Taxonomic Note: Little known species.
Taxonomic References: Wells (1973a); Zlatarski and Estalella (1982); Veron (2000a);
Identification Guides: Humann (2002);
