Brain coral - Brain coral

Japanese: ノウサンゴ(脳珊瑚) - ノウサンゴ（英語表記）brain‐coral

A species of coelenterate (cnidaria) in the family Platygyridae of the subclass Hexacorallia of the class Anthozoa, or a general term for species in the genus Platygyra. The brain coral Platygyra lamellina (illustration) is widely distributed from Suruga Bay to the South Pacific and is an important species of reef-building coral. It forms disc-shaped or clumpy colonies, and the largest ones can reach over 1m in diameter. The capsule pore surrounded by the capsule wall is long and undulating, forming a brain shape, with 12 to 18 septa per centimeter. During the day, the polyps do not extend and remain hidden within the green capsule pore, but at night they become active, extending their translucent tentacles by several centimeters.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

花虫綱六放サンゴ亜綱キクメイシ科の腔腸動物(刺胞動物)の1種，またはノウサンゴ属の種類の総称。ノウサンゴPlatygyra lamellina（イラスト）は駿河湾から南太平洋にかけて広く分布し，造礁サンゴの重要な1種。盤状または塊状の群体になり，大きなものでは直径1m以上になる。莢壁（きようへき）にとりかこまれた莢孔は長くうねって全体が脳状になり，隔壁は1cmに12～18本ある。昼間はポリプをのばさず，緑色の莢孔内に隠れているが，夜になると活動を始め，半透明の触手を数cmものばす。

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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