A coelenterate (cnidaria) of the family Acropora (anthozoa) (illustration). This is a typical species that forms reef-building corals, and is widely distributed from the warm currents of Japan to the southern seas. The short branches fuse together and spread out in a plane, forming a flat colony 1 to 2 meters in diameter. The upper surface is densely covered with short branches pointing upward, but the underside is flat and has no protrusions. The calcareous skeleton is porous and not hard. The polyps are green or brown in color because countless tiny zooxanthellae (zooxanthellae) live symbiotically with them. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
花虫綱ミドリイシ科の腔腸動物(刺胞動物)(イラスト)。造礁サンゴを形成する代表的な種類で,日本の暖流域から南方の海域に広く分布する。短い枝が互いに癒合し合いながら一平面に広がって直径1~2mの平盤状の群体になる。上面には短い枝が上方に向けて密生するが,下面は平たく,突出物はない。石灰質の骨格は多孔質なために硬くはない。ポリプには無数の微小なゾーキサンテラ(褐虫藻類)が共生しているため,緑色や褐色である。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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