Acanthastrea
Acanthastrea is a genus of large polyp stony corals in the family Lobophylliidae. The colonies are massive and usually flat. The corallites are either circular or angular in shape. The septa are thick near the wall of the corallite, becoming thin near the columella, and have tall teeth. The polyps are extended only at night.
The genus contains the following species:Acanthastrea brevis Milne Edwards & Haime, 1849Acanthastrea echinata Acanthastrea hemprichii Acanthastrea minuta Moll & Best, 1984Acanthastrea pachysepta Acanthastrea polygonalis† Martin, 1880Acanthastrea rotundoflora Chevalier, 1975Acanthastrea subechinata Veron, 2002