https://cdn.earthdata.nasa.gov/conduit/upload/5182/KeywordsCommunityGuide_Baseline_v1_SIGNED_FINAL.pdf 23.6 2026-03-19T10:41:57.720Z https://gcmd.earthdata.nasa.gov/KeywordViewer/scheme/sciencekeywords/dd4de9c8-e078-43cf-a7d8-78f289c8618e HARD OR STONY CORALS Date=2017-03-13 User Id=mgenazzi Entity=Definition Operation=INSERT User Note=Definition added System Note=insert Definition New Value=id: null text: Scleractinia is a subclass of class Anthozoa (Phylum Cnidarian) of water-based organisms formed by colonial polyps with hexamerous symmetry, eight and ten part symmetry is not uncommon. Stony corals, known as hard corals or 'reef-building corals, are sessile marine organisms that secrete a calicum carbonate skeleton to protect it's soft body. Polyps are individual animals with a cylindrical body crowned by an oral disc and mouth surrounded by tentacles. language code: en Scleractinia is a subclass of class Anthozoa (Phylum Cnidarian) of water-based organisms formed by colonial polyps with hexamerous symmetry, eight and ten part symmetry is not uncommon. Stony corals, known as hard corals or 'reef-building corals, are sessile marine organisms that secrete a calicum carbonate skeleton to protect it's soft body. Polyps are individual animals with a cylindrical body crowned by an oral disc and mouth surrounded by tentacles. 2017-03-13 14:09:01.0