Also known as Branching Coral, Bush Coral, Finger Staghorn Coral, Humilis Acropora, Staghorn Coral, Stumpy Acropora.
Found over exposed shallow to intermediate depths of reef slopes, reef tops and submerged reefs. Very common and sometimes dominates reefs. Various colours with blue or cream tips and finger like branches.
They feed on plankton.
Length - 17cm
Depth - 1-25m
Stony corals have hard stony skeletons, their polyps have six tentacles or are made up of multiples of six. These are usually nocturnal, however if the sky's are overcast, then many will feed during the day.
Generally the more robust corals life on exposed areas, while the smaller corals live in sheltered lagoons or deeper waters.
Stony corals are reef building corals and embedded in their flesh are thousands of minute single-celled marine plants called zooxanthellae which accounts for their colour.
These corals support a huge diversity of life, their main predator being the crown-of-thorns sea star. Ref: http://www.coralsoftheworld.org/species_factsheets/species_factsheet_summary/acropora-humilis/