Saltwater
Horn coral
Hydnophora rigida
Merulinidae
Hydnophora rigida
Merulinidae
Seen in the wild in Australia, Fiji, French Southern Territories, India, Indonesia, Japan, Kiribati, Malaysia, and 8 more countries.
Hydnophora rigida, commonly known as horn coral, are found in reefs and are in the genus Hydnophora. They were first described by James Dwight Dana in 1846. Their color is naturally green and brown, or sometimes cream. They can also become fluorescent green and cyano-red emission.