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[28] High failure rates afflict many stages of this process, and even though millions of gametes are released by each colony, few new colonies form. The time from spawning to settling is usually two to three days, but can be up to two months.[29] The larva grows into a polyp and eventually becomes a coral head by asexual budding and growth.
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[10] In most corals, the tentacles are retracted by day and spread out at night to catch plankton and other small organisms. Shallow water species of both stony fonte and soft corals can be zooxanthellate, the fonte corals supplementing their plankton diet with the products of photosynthesis produced by these symbionts.[oito] The polyps interconnect by saiba mais a complex and well-developed system of gastrovascular canals, allowing significant sharing of nutrients and symbionts.[11]
A typical coral colony forms several thousand larvae per year to overcome the odds against formation of a new colony.[26]
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Many corals, as well as other cnidarian groups such as sea anemones form a symbiotic relationship with a class of dinoflagellate algae, zooxanthellae of the genus Symbiodinium, which can form as much as 30% of the tissue of a polyp.[16]:23-24 Typically, each polyp harbors one species of alga, and coral species show a preference for Symbiodinium.[17] Young corals are not born with zooxanthellae, but acquire the algae from the surrounding environment, including the water column and local sediment.
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Presently, corals are classified as certain species of animals within the sub-classes Hexacorallia and Octocorallia of the class Anthozoa in the phylum Cnidaria.[6] Hexacorallia includes the stony corals and these groups have polyps that generally have a seis-fold symmetry.