Alex Mustard / Great star coral (Montastrea cavernosa) male releasing clouds of sperm into the water column, during its synchronised annual spawning event, several hours after sunset in late summer, East End, Grand...

Alex Mustard / Great star coral (Montastrea cavernosa) male releasing clouds of sperm into the water column, during its synchronised annual spawning event, several hours after sunset in late summer, East End, Grand...

Pete Oxford / Three spot damselfish, juvenile (Stegastes / Pomacentrus planifrons) on Great Star coral (Montastraea cavernosa) Bonaire, Netherlands Antilles, Caribbean

Pete Oxford / Bicolor damselfish (Stegastes partitus) and Great star coral (Montastraea cavernosa) Bonaire, Caribbean

Christian Ziegler / Great Star Coral (Montastraea cavernosa) growing directly beneath Red Mangroves (Rhizophora mangle), Bastimentos Marine National Park, Bocas del Toro, Panama

Christian Ziegler / Great Star Coral (Montastraea cavernosa) growing directly beneath Red Mangroves (Rhizophora mangle), Bastimentos Marine National Park, Bocas del Toro, Panama

Pete Oxford / Christmas Tree Worm (Spirobranchus giganteus) filter feeding while attached to Great Star Coral (Montastraea cavernosa), Bonaire, Netherlands Antilles, Caribbean

Pete Oxford / Christmas Tree Worm (Spirobranchus giganteus) filter feeding while attached to Great Star Coral (Montastraea cavernosa), Bonaire, Netherlands Antilles, Caribbean

Juergen Freund / Detail of Giant basket star (Astrophyton muricatum) Papua New Guinea.

Juergen Freund / Detail of Giant basket star (Astrophyton muricatum) Papua New Guinea.

Claudio Contreras / Great star coral (Montastraea cavernosa) in front of a sea fan base (Gorgonia sp) Banco Chinchorro Biosphere Reserve, Caribbean Sea, Mexico, May

Claudio Contreras / Great star coral (Montastraea cavernosa) polyps, Banco Chinchorro Biosphere Reserve, Caribbean Sea, Mexico, May