A planktonic protochordate belonging to the family Pycnonotidae of the class Uguisu. It is so named because when stimulated, the left and right peripharyngeal glands glow blue-green. It is distributed in all oceans, but is particularly common in the Pacific Ocean and is also commonly seen in the waters off Japan. The 3-8 mm reddish-orange individual zooids are regularly arranged and form hollow cylindrical colonies 10-20 cm long (occasionally 50 cm). The surface has many somewhat hard agar-like projections, with water inlet openings at their bases and water outlet openings into the common drainage cavity. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
尾索(びさく)綱ヒカリボヤ科に属する浮遊性の原索動物。刺激すると左右の囲咽帯(いいんたい)が青緑色に発光するのでこの名がある。各大洋に分布するが,とくに太平洋に多く,日本近海にもふつうに見られる。3~8mmの赤橙色の個虫が規則正しく配列し,長さ10~20cm(ときに50cm)の円筒状で中空の群体をつくる。表面には,多くのやや硬い寒天質の突起があり,その基部に入水孔が開き,出水孔は共同排水腔に開いている。
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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