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Lobophyllia corymbosa
''Lobophyllia corymbosa'', the lobed cactus coral or brain root coral, is a species of large polyp stony coral in the family Lobophylliidae.〔 It occurs on reefs in shallow waters in the Red Sea, off the coast of East Africa, and in other parts of the tropical Indo-Pacific.
==Description==
''Lobophyllia corymbosa'' is a coral that either forms flat sheets or hemispherical domes. Though usually under in diameter this coral is sometimes several times that size. In the Red Sea, particularly large specimens are found. The individual lobes of the coral are united at their bases and are long and wide. The polyps are large and each one secretes a corallite or stony cup around itself. These are irregular in shape and form the skeleton of the coral. There is a distinct wall between the corallites, each one of which has numerous radiating vertical ridges known as septa. These septa are narrow within the corallite but thicker and longer on the walls. Their blunt teeth give the coral a prickly appearance. The corallites tend to be the shape of an hourglass and the polyps inside are thick and fleshy. They are normally retracted in the daytime but extend their tentacles at night to feed. The colour of the polyps is bluish or greenish-grey, or yellowish-brown.〔(【引用サイトリンク】title=Lobed brain coral )〕 This colour is due to the zooxanthellae, the minute symbiotic dinoflagellates which reside within the tissues of the coral. These photosynthetic algae use sunlight to create organic compounds and the coral is able to use these as part of its nutritional needs.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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