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Great star coral
The great star coral (''Montastraea cavernosa'') is a colonial stony coral found in the Caribbean seas. It forms into massive boulders and sometimes develops into plates. Its polyps are the size of a human thumb and fully extend at night.〔(【引用サイトリンク】title= Common Corals of Florida )〕
==Description==
Great star coral colonies form massive boulders and domes over 5 feet (1.5 m) in diameter in waters of shallow and moderate depths. In deeper waters, this coral has been observed growing as a plate formation. It is found throughout most reef environments, and is the predominant coral at depths of 40–100 feet (12.2-30.5 m).
This coral occasionally has a fluorescent red or orange color during daytime; it has recently been suggested that this hue is due to phycoerythrin, a cyanobacterial protein. It appears that, in addition to symbiotic zooxanthella, this coral harbors endocellular symbiotic cyanobacteria, possibly to help it fix nitrogen. However more recently, Oswold ''et al.'' (2007) showed an absence of functional phycoerythrin in ''M. cavernosa''.〔(Contributions of host and symbiont pigments to the coloration of reef corals ), Franz Oswald, Florian Schmitt, Alexandra Leutenegger, Sergey Ivanchenko, Cecilia D'Angelo, Anya Salih, Svetlana Maslakova, Maria Bulina, Reinhold Schirmbeck, G. U. Nienhaus, Mikhail V. Matz, Jörg Wiedenmann, FEBS Journal, Volume 274, Issue 4, pages 1102–1122, February 2007〕
A related species is ''M. annularis'', which has smaller polyps.
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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