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Pillar coral
Pillar coral (''Dendrogyra cylindricus'') is a hard coral (order Scleractinia) found in the western Atlantic Ocean and the Caribbean Sea. It is a digitate coral -that is, it resembles fingers (Latin ''digites'') or a cluster of cigars, growing up from the sea floor without any secondary branching. It is large and can grow on both flat and sloping surfaces at depths down to 20 m (65 ft). It is one of the few types of hard coral in which the polyps can commonly be seen feeding during the day.
==Description==
Pillar coral forms an encrusted base from which grow vertical cylindrical, round-ended columns. This coral can grow to a height of with pillars more than wide but is usually much smaller than this. The corallites from which the polyps protrude are smaller than in diameter and arranged in shallow meandering valleys with low ridges in between. The skeleton of the coral is not usually visible because the polyps are typically extended during the daytime, unlike most other coral species.〔 The mass of undulating tentacles gives the coral a furry appearance. This coral is usually some shade of beige or brown.
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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