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coral
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Coral species include the important reef builders that inhabit tropical oceans and secrete calcium carbonate to form a hard skeleton. A coral "group" is a colony of very many genetically identical polyps. Each polyp is a sac-like animal typically only a few millimeters in diameter and a few centimeters in height.
Coral, any of a variety of invertebrate marine organisms of the class Anthozoa that are characterized by skeletons—external or internal—of a stonelike, horny, or leathery consistency. The term coral is also applied to the skeletons of those animals, particularly to those of the stonelike corals.
Coral is a sessile animal that forms symbiotic partnerships with plant-like algae to build coral reefs. Learn how coral polyps, algae, and climate change affect coral health and diversity.
Learn about coral, a colonial animal that forms reefs with algae and hosts diverse marine life. Find out how coral reefs are threatened by pollution and warming waters, and how they benefit people and the ocean.
Learn about the diversity, characteristics, benefits, and threats of coral reefs, some of the most diverse ecosystems in the world. Find out how NOAA scientists and educators study, protect, and restore these vital habitats.
Learn about corals, their structure, growth, reproduction, and distribution. Find out how corals are animals, not plants or rocks, and how they form reefs with zooxanthellae algae.
This cutaway diagram of a coral polyp shows where the photosynthetic algae, or zooxanthellae, live—inside the polyp's tissue. The coral gives the algae a home. In return, the algae provide the coral with food. Learn more in the Ocean Portal's coral reef section and in this zooxanthellae slideshow.
Learn about corals, diverse groups of invertebrate animals that form reefs and support many marine species. Find out how NOAA Fisheries works to protect corals from human threats and restore coral habitats.
Reef-building corals create habitats for many other organisms. Coral reefs are highly diverse and unique around the world, providing shelter and sustenance for abundant fishes and other marine life. (Woods Hole Oceanographic Institution) Many people think of coral as hard, rock-like formations that attract abundant, diverse marine life. In fact, corals are themselves tiny marine animals called ...
Coral Biology The basic living unit of the class Anthozoa (further subdivided into subclass Hexacorallia, which includes stony corals, and subclass Octocorallia, which includes soft corals) is the polyp. Polyps can occur either singularly, as in the case of anenomes, or can form colonies, as they do in stony and soft corals.