13776751 - A close look at the detail of Brain coral (Platygyra sinensis) during the day with the its polyps closed; Yap, Federated States of Micronesia13776730 - Gymnosome pteropod (Hydromyles globulosa), a shell-less, planktonic mollusk sometimes called the sea butterfly; Bali, Indonesia13776594 - This Pelagic tunicate or salp (Salpa aspera) is part of the Salpidae family of gelatinous animals; Yap, Federated States of Micronesia13778370 - Annular band of live Lobe Coral (Porites lobata) growing over dead corals off the Kona coast, the Big Island; Island of Hawaii, Hawaii, United States of America13778375 - Spiral Wire Coral (Cirrhipathes spiralis) living on the backwall of Molokini Crater, offshore of Maui; Molokini Crater, Maui, Hawaii, United States of America13778359 - Box Jellyfish, also known as Sea Wasp (Alatina alata), swims by during a blackwater dive off the Kona coast, the Big island, Hawaii, USA. While not fatal like its Australian relatives, this box jellyfish can deliver a nasty sting; Island of Hawaii, Hawaii, United States of America13778373 - Surrounded by patches of Rice Coral (Montipora capitata), a Red Slate Pencil Urchin (Heterocentrotus mamillatus) and a Needle-spined (Urchin Echinostrephus aciculatus) rest on Molokini Backwall which is located offshore of Maui, Hawaii, USA; Molokini Crater, Maui, Hawaii, United States of America
