Franco Banfi / Bulb tentacle sea anemone (Entacmaea quadricolor) close up detail, Maldives, Indian Ocean

David Fleetham / Gorgonian coral (Gorganacea) with polyps extended for feeding, Savusavu, Fiji.

Juergen Freund / Blue buttons {Porpita porpita} various color morphs, Indo-pacific

Juergen Freund / Blue button {Porpita porpita} Indo-pacific

Juergen Freund / Pink squat lobster (Lauriea siagiani) on Barrel sponge, Indo-Pacific

Juergen Freund / Blue button {Porpita porpita} Indo-pacific

Juergen Freund / Mushroom coral (Fungia genus), Queensland, Australia

Juergen Freund / Abstract view of sea slug / Nudibranch {Nudibranchia} on various corals, Indo-Pacific

Flip Nicklin / Underwater sunlight reflections

Juergen Freund / Close up of eye of pufferfish {Arothron sp} Indo Pacific

Hiroya Minakuchi / Amazon River Dolphin (Inia geoffrensis) view of the surface of the Amazon River, Rio Negro, Brazil

Roberto Rinaldi / Coral (Mycedium sp) fluorescence at night, Red Sea