Fred Bavendam / Staghorn Coral (Acropora cervicornis) colony with an extensive bleached area at its center, Kimbe Bay, Papua New Guinea

Magnus Lundgren / Wild Wonders of China / Hard coral or stony coral (Scleractinia). Xiaoliuqiu Island, Taiwan

Magnus Lundgren / Wild Wonders of China / Hard coral polyps, or stony coral polyps (Scleractinia) Xiaoliuqiu Island, Taiwan

Gary Bell/ Oceanwide / Disc Coral (Turbinaria reniformis) and Banana Fusilier (Pterocaesio pisang) school, Great Barrier Reef, Australia

Gary Bell/ Oceanwide / Hard Tube Coco Worm (Protula magnifica) filter feeding in Euphyllia Coral (Euphyllia ancora), Great Barrier Reef, Australia

Gary Bell/ Oceanwide / Blue-striped Blenny (Plagiotremus rhinorhynchos) in brain coral, Great Barrier Reef, Australia

Magnus Lundgren / Wild Wonders of China / Stony coral (Scleractinia) close up, Pak Lap Tsai, Sai Kung, Hong Kong, China

Linda Pitkin / Stony coral (Porites sp.) with Anthias (Pseudanthias squamipinnis) Ras Ghozlani, Ras Mohammed National Park, Egypt, Red Sea.

Linda Pitkin / Stony coral (Porites sp.) with Anthias (Pseudanthias squamipinnis), and diver Ras Ghozlani, Ras Mohammed National Park, Egypt, Red Sea.

Linda Pitkin / Wreckage colonised by soft corals, stony corals, and fire coral Jolande wreck, Ras Mohammed National Park, Egypt, Red Sea.

Linda Pitkin / Wreckage colonised by soft corals, stony corals, and fire coral, with divers Jolande wreck, Ras Mohammed National Park, Egypt, Red Sea.

Norbert Wu / Disc Coral (Turbinaria reniformis) reef, Papua New Guinea