Tara Pacific expedition - november 2017 Fire Corals (Millepora dichotoma) are colonial marine organisms that exhibit physical characteristics similar to that of coral. The name coral is somewhat misleading, as fire corals are not true corals but are more closely related to Hydra and other hydrozoans, making them hydrocorals. D: 6 m Fore reef, Banban and Muli Islets, Papua New Guinea