Saltwater
Blue coral
Heliopora coerulea
Helioporidae
Heliopora coerulea
Helioporidae
Seen in the wild in Australia, British Indian Ocean Territory, Christmas Island, Guam, India, Indonesia, Japan, Malaysia, and 11 more countries.
Blue coral (Heliopora coerulea) is a species of colonial coral. It is the only octocoral known to produce a massive skeleton. This skeleton is formed of aragonite, similar to that of scleractinia. Individual polyps live in tubes within the skeleton and are connected by a thin layer of tissue over the outside of the skeleton.