...A parasitic microorganism whose body is made up of a small number of cells. It was named by van Beneden (1876) as a group that is in the middle of the evolutionary process from protozoa to metazoa. However, some scholars currently believe that it is a degenerate form of the trematodes of flatworms due to parasitic life, that it is a degenerate form of the annelid worms due to the cilia covering its body and the position of its reproductive pores, and that it is a closely related animal to the coelenterates because it resembles the larvae of the coelenterates. However, the true phylogenetic relationship has not yet been clarified. *Some of the terminology explanations that mention "van Beneden" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…体が少数の細胞からできている寄生性の微小動物。原生動物から後生動物へ進化する中間に位置する一群としてファン・ベネデンvan Benedenにより名づけられた(1876)。しかし,現在では扁形動物の吸虫類が寄生生活によって退化したもの,また体をおおう繊毛や生殖孔の位置から環形動物のユムシ類が退化したもの,また腔腸動物の幼生に似ているところから腔腸動物と近縁な動物と考える学者などがおり,まだ系統上の真の解明はなされていない。… ※「van Beneden」について言及している用語解説の一部を掲載しています。 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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