Fused Staghorn Coral

Acropora prolifera is very similar to staghorn coral (Acropora cervicornis) in appearance but usually forms smaller, denser clumps. The branches are mostly horizontal and often divide near the tip, sometimes fusing with other branches. It also resembles elkhorn coral (Acropora palmata) and genetic studies show that it is a hybrid between that and staghorn coral. The corallites, the calcareous skeletal cups in which the polyps sit, are tubular and protrude from the surface of the branches. They are tightly packed and arranged in linear rows and there is a larger corallite at the tip of each branch. The branches are up to 2 cm (0.8 in) in diameter and the whole colony may grow to 1.2 metres (3 ft 11 in) across. The general colour is pale yellowish-brown and the branches have paler tips.

Acropora prolifera is found in the Caribbean Sea, the Gulf of Mexico, the Bahamas and southern Florida southwards to Colombia and Venezuela. It is generally found on outer reef slopes, in calm-water bays and in the lee of land masses, most commonly at a depth of around 7 metres (23 ft) but occasionally down to about 30 metres (98 ft). It is generally an uncommon species.