Morphological observations of living corals at Cozumel (Mexico), Martinique, St. Lucia, the Cayman Islands, and Roatan (Honduras) support the view that Siderastrea radians, Siderastrea siderea, Isophyllastrea rigida, Isophyllia sinuosa, Madracis mirabilis, Madracis decactis, Agaricia
lamarcki, Agaricia undata, Mussa angulosa, Mussa cubensis(≡Scolymia cubensis), Millepora alcicornis, Millepora complanata, and Millepora squarrosa represent valid species. However, Colpophyllia breviserialis is not supported as a valid species separate
from Colpophyllia natans; Madracis pharensis is supported as a form or ecomorph of Madracis decactis; and Scolymia lacera is supported as a form or ecomorph of Mussa angulosa. Madracis mirabilis f. martiniquensis (new form) has flat-ended branches of variable
outline and diameter. Calices on the branch ends are deep and cerioid, and some lack a styliform columella, are recessed, and/or lack exsert septa. Living colonies are yellow-brown.
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