How To Identify Smooth Flower Coral

Eusmilia is easy to spot, with its large tubular ­corallites and pale-yellow color. Being the only species like it in the Caribbean, this recognizable coral should be easy to spot and a joy to photograph.
Eusmilia colonies can grow into small mounds about 20 inches across. The colony grows long tubular corallites that extend from the base in groups of one to three tubes. Corallites are the part of the coral where polyps live.

The tips of each corallite are oval or peanut shaped and have a ridged texture. At night, fleshy polyps extend from the corallite to feed on passing zooplankton.

When the polyps are extended, this coral has a flower-like appearance, which is where it gets

Source: scuba diving