Chattonella (English spelling)

Japanese: シャットネラ（英語表記）Chattonella

An alga that grows in large numbers in the Seto Inland Sea and other inland bays south of the Kinki region during the hot summer months off the coast of Japan, causing red tides and often causing serious damage to farmed fish and shellfish. Also called Cattonella. Hornelia is another name. Its body is single-celled, obovate or spindle-shaped, and it swims by extending two flagella of slightly different lengths from a small depression at the front end. One flagellum that extends forward when swimming has a feather-like structure, while the other that extends backward has a whip-like structure. The cells are divided into ectoplasm and endoplasm, the former containing plastids and the latter containing nuclei.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

日本沿岸では夏季高温時に，瀬戸内海など近畿以南の内湾域に大発生して赤潮をつくり，しばしば養殖魚介類に甚大な被害を与える藻類。カットネラともいう。ホルネリアHornelliaは異名。体は単細胞で，倒卵形ないし紡錘形を呈し，前端の小さい凹みから長さの少し異なる2本の鞭毛をだして泳ぐ。遊泳時に前方に伸びる1本の鞭毛は羽型構造であるのに対し，後方に伸びる他の1本はむち型構造である。細胞は外部原形質と内部原形質に区別され，前者には色素体が，後者には核などが存在する。

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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