Alex Mustard / Grooved brain coral (Diploria labyrinthiformis) at night with polyps extended to feed, Grand Cayman, Cayman Islands, British West Indies. Caribbean Sea.

Alex Mustard / Brain coral (Pseudodiploria strigosa) photographed under blue light to excite the fluorescence, Little Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Juergen Freund / Brain coral (Diploria labyrinthiformis). Caribbean

Pascal Kobeh / Symmetrical brain coral (Diploria sp), close up, in coral reef with many fish. Flores Sea, Indonesia.

Linda Pitkin / Yellow goatfish (Mulloidichthys martinicus), by Grooved brain coral (Diploria labyrinthiformis) Bonaire: Captain Don's Habitat, House Reef, February

Adrian Davies / Fossilised Grooved brain coral (Diploria labyrinthiformis) Barbados.

Adrian Davies / Fossilised Grooved brain coral (Diploria labyrinthiformis). Barbados.

Adrian Davies / Fossilised Grooved brain coral (Diploria labyrinthiformis). Barbados.

Pete Oxford / Brain Coral (Diploria labyrinthiformis), Banco Chinchorro, Yucatan Peninsula, Mexico

Pascal Kobeh / Brain coral (Diploria labyrinthiformis) Guadeloupe Island, Mexico. Caribbean.

Pascal Kobeh / Brain coral (Diploria labyrinthiformis) with diver, Guadeloupe Island, Mexico. Caribbean. August 2012.

Franco Banfi / Close up detail of Brain coral (Diploria genus) Maldives, Indian Ocean