What: Macro photo of the surface of a Labyrinthine brain coral (Diploria labyrinthiformis).
The polyps, which usually extend at night, live in the 'valleys' between the ridges.
These corals form hemispherical heads that can grow to four feet in diameter.
Where: I photographed this coral off the coast of Grand Cayman. This species is found throughout the Caribbean and is also found around the Bahamas and south Florida.