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Oulophyllia crispa : ウィキペディア英語版 | Oulophyllia crispa
''Oulophyllia crispa'', sometimes called the intermediate valley coral, is a species of stony coral in the family Merulinidae. It is native to the tropical western and central Indo-Pacific region. Although this coral has a wide range, it is generally uncommon and seems to be decreasing in abundance, and the International Union for Conservation of Nature has rated its conservation status as being "near threatened".〔 ==Description== Colonies of this coral form massive hemispherical domes, stacks or plates that can be a metre (yard) or more across, but in the Red Sea, it seldom exceeds . The corallites are arranged in broad meandering valleys with acute-edged ridges separating them. The septa are thin and evenly spaced, and slope uniformly to the central columella. The polyps only expand at night; they are large and fleshy and have white-tipped tentacles. The colour of this coral is usually some shade of brown, grey or green, sometimes with contrasting oral discs. This coral is somewhat similar in appearance to ''Platygyra daedalea''.〔
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