Jeff Rotman / Gorgonian Seafan Coral (Gorgonacea) polyps open to feed at night. South China Sea, Sipadan Island, Borneo.

Juergen Freund / Star shaped Pincushion / Pillow cushion starfish (Culcita novaeguinea), detail of the underbelly. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Close up of Parrotfish eye {Scaridae} Sulu-sulawesi seas, Indo Pacific

Juergen Freund / Close up of Parrotfish mouth showing teeth {Scaridae} Sulu-Sulawesi seas, Indo-pacific

Tim Laman / Close-up of moss fronds. Foja Mountains, Papua, Indonesia, 2007.

Juergen Freund / Mimic octopus (Thaumoctopus mimicus) head and body, seen from above. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Star shaped Pincushion / Pillow cushion starfish (Culcita novaeguinea), detail of the underbelly. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Close-up of the fin and flank of an Emperor angelfish (Pomacanthus imperator). Misool, Raja Ampat, West Papua, Indonesia

Alex Mustard / An Ornate Ghost Pipefish (Solenostomus paradoxus) in front of a crinoid. Raja Ampat, West Papua, Indonesia, February.

Tim Laman / Close-up of colony of Tunicates / Sea squirts (Tunicata) Malapascua Island. Visayan Sea, Philippines

Tim Laman / Sea urchin (Echinoidea) detail, with anus visible, Malapascua Island. Visayan Sea, Philippines

Constantinos Petrinos / Emperor shrimp {Periclimenes imperator / Zenopontonia rex} and tiny harlequin crab {Lissocarcinus orbicularis} on sea cucumber {Bohadschia argus} Sulawesi Indonesia