Alex Mustard / Hard corals (including Acropora sp., Platygyra sp. and Pocillopora spp.) growing in shallow water and reflected in the surface. Ras Umm Sid, Sharm El Sheikh, Sinai, Egypt. Red Sea

Jurgen Freund / Large round Brain coral (Platygyra lamellina) on coral reef, North Sulawesi, Indonesia.

Jurgen Freund / Large round Brain coral (Platygyra lamellina) on coral reef, North Sulawesi, Indonesia.

Jurgen Freund / Hard brain coral (Platygyra sp) half covered with a pink algae, Moluccas Islands, Indo-pacific

Alex Mustard / Brain coral (Platygyra daedalea) beneath a breaking storm wave, on a coral reef. Sha'ab Claudia, Fury Shoal, Egypt. Red Sea

Tony Wu / Hard coral (Platygyra) in shallow blue water, Ambon, Indonesia

Jurgen Freund / Crown of thorns starfish (Acanthaster planci) on the side of a Platygyra coral and digesting it with its stomach. Great Barrier Reef, Queensland, Australia.

Pascal Kobeh / Honeycomb moray (Gymnothorax favagineus) out of its burrow / its hole close to a brain coral (Platygyra lamellina) with another one behind it, Daymaniyat islands, Oman. Gulf of Oman.

Jurgen Freund / Hard brain coral (Platygyra sp) covered with pink algae and fish, Moluccas Islands, Indo-pacific.

Jurgen Freund / Hard coral {Platygyra sp}, fluorescent under UV light, Great Barrier Reef & Coral Sea, Australia

Ingo Arndt / Lesser Valley Coral (Platygyra daedalea) from the Red Sea, Collection Meeresmuseum Ozeania, Riedenburg, Germany

Gary Bell/ Oceanwide / Coral (Platygyra sp), Christmas Island, Australia

Gary Bell/ Oceanwide / Coral (Platygyra sp), Christmas Island, Australia

Gary Bell/ Oceanwide / Coral (Platygyra sp) polyp, Great Barrier Reef, Australia