Morphologic Description: Plocoid; extramural budding; small septal teeth; strong costae; trabecular columella; septothecal wall structure.
Morphologic Diagnosis: Colony Form: plocoid, Colony Shape: massive or platy, Budding: extramural, Columella: trabecular and discontinuous, Corallite Size: medium (1.5 - 10mm), Wall Structure: septothecal, Lobes: none.
I. Montastraea with approx. 24 septa.
II. Montastraea with >>24 septa.