A genus of the family Peridiniaceae in the class Dinoflagellates, it has a unicellular body with armored plates, and is characterized by the fact that the left side of the lateral groove is lower than the right side when viewed from the ventral surface. It has two flagella, a lateral flagellum that follows the lateral groove in a coiled manner and a longitudinal flagellum that extends backward from the longitudinal groove, and swims by rotating its body, living as plankton. When environmental conditions are good, it multiplies asexually by diagonal binary fission, but when conditions deteriorate, it sinks to the seafloor and forms a thick-walled cyst. When the environment improves, the cysts germinate and release swimming cells with armored plates. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
渦鞭毛藻綱ペリジニウム科の1属で,体は単細胞で鎧板をもち,腹面から見るとき,横溝の左側が右側より低い位置にあるのが特徴である。巻くように横溝に沿う横鞭毛と縦溝から後方に伸びる縦鞭毛の計2本の鞭毛をもち,体を回転させながら泳ぎ,プランクトン生活をする。環境条件がよいときは,斜めに二分裂する無性生殖により増殖するが,条件が悪化すると海底に沈み,厚膜のシスト(囊子)を形成する。環境が好転すると,シストは発芽して鎧板のある泳ぐ細胞を放出する。
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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