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Astrangia solitaria
''Astrangia solitaria'', the dwarf cup coral or southern cup coral, is a species of stony coral in the family Rhizangiidae. It is native to shallow water in the western Atlantic Ocean and the Caribbean Sea.
==Description==
A colony of ''Astrangia solitaria'' consists of a small number of cylindrical corallites (stony cups), in diameter and high, each secreted by the polyp that sits inside it. New polyps grow on short stolons and the coenosarc (soft tissue) does not cover the skeleton in a continuous sheet as it does in most coral species. The stolons may become abraded leaving the individual polyps completely or semi-separated. The corallites can have 48 septa (stony ridges) but 36 is a more usual number. The septa of adjoining corallites are connected by wide, flat, granular costae (ridges). The colour of this coral is usually pale brown, but the corallites may have brown extremities and white bases, or even be completely white. ''A. solitaria'' can be confused with the northern cup coral (''Astrangia poculata'') but that species usually forms clumps with more numerous, smaller corallites. ''A. poculata'' often contains symbiotic zooxanthellae in its tissues while ''A. solitaria'' does not.〔
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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