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Plerogyra sinuosa
''Plerogyra sinuosa'' is a species of "bubble coral". It has grape-sized bubbles which increase their surface area according to the amount of light available: they are larger during the day, but smaller during the night, when tentacles reach out to capture food. This species requires low light and a gentle water flow. Common names for ''Plerogyra sinuosa'' include "grape coral", "bladder coral", "pearl coral" and "branching bubble coral".〔"Descriptions and articles about the Bubble Coral (Plerogyra sinuosa)." Brief summary. EOL. Web. 17 Mar 2014. .〕
==Description==
Colonies of ''Plerogyra sinuosa'' are in the form of an inverted cone that may be as much as a metre (yard) across. The corallites in small colonies are monocentric and trochoid, but become flabellomeandroiid (arranged in valleys, the neighbouring valleys having separate walls) in larger colonies. The septa have smooth margins but are irregularly arranged giving the colony an untidy appearance. The costae on young colonies sometimes form lobes which develop spines. These spines then elongate and a new polyp develops, this budding method being an unusual occurrence among corals.
In the living coral, ''Plerogyra sinuosa'' has vesicles resembling bubbles up to in diameter. These enlarge during the day but retract to a certain extent during the night to expose the polyps and their tentacles.〔
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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