Download - Polyps
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Sea Anemones Corals
Polyps
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Corals
Reef building corals are hermatypic, meaning they are mound builders.
Bodies contain masses of single-celled, symbiotic dinoflagellates called zoozanthellae, which carry on photosynthesis, absorb waste products, grow, and divide within the coral host.
Coral polyps provide dinoflagellates with a safe and stable environment, carbon dioxide, and nutrients.
Zooxanthellae provide oxygen, carbohydrates, and pH necessary to deposit calcite. Also give corals their color.
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Coral Morphology
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CoralsReefs grow in the photic
zoneDepend on light and warmthGrow best in brightly lit
water of about 5 to 10 meters (16-33 feet) deep.
Prefer clear water with little sediment
Coral polyps can also retract into their shells to escape strong sunlight and predators.
Exposure to fresh water is fatal