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Stony Corals at
Bluff Island,Sai Kung |
What is stony coral?
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Corals in order Scleractinia and possess solid calcium carbonate skeleton
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Usually bear 12 tentacles which are always number in multiples of six
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Some corals in class Hydrozoa and in sub-class Octocorallia can also deposit hard skeleton, but they have distinctive skeleton structure and number of tentacles
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Approximately 800 known species of stony corals
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