A general term for flatworms belonging to the order Polycladida of the class Turbellaria. This name comes from their flat bodies. All are marine and many live on the undersides of stones in the intertidal zone, but some are internally or externally parasitic on other animals or have a planktonic lifestyle. Their bodies are broad, leaf-like or band-like. They are 0.7 to 50 mm long, and the cell layer covering their surface contains ciliated cells, glandular cells, and sensory cells, which secrete fluid from the glandular cells and move by gliding over rocks using the cilia. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
渦虫綱多岐腸目Polycladidaに属する扁形動物の総称。体が扁平なところからこの名がある。すべて海産で,潮間帯の石の裏側にすむものが多いが,なかには他の動物に内部あるいは外部寄生するもの,または浮遊生活するものもある。体は幅広い葉状や帯状。体長は0.7~50mm,体の表面をおおっている細胞層には繊毛をもった繊毛細胞,腺細胞,感覚細胞などがあり,腺細胞から液を分泌し,繊毛によって岩の上などをすべるように移動する。
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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