© Copyright 2011 Andrew Trevor-Jones
Hydrocoral, Distichopora sp., near Bonzer Wreck, Mele Bay, Efate, Vanuatu. Depth 16.5 metres.
Nikon D300, Nikkor 60mm f/2.8D, Ikelite housing, Flat port, 2 x DS125 strobes
ISO 200, 1/250s, f/16
While this looks similar to true corals it is actually quite different and is more closely related to hydra and Portuguese man-o-war (bluebottles).