...Because this individual can grow and multiply in a culture medium containing organic matter, it is speculated that the Astasia genus, which does not have naturally growing chloroplasts, may have evolved from the Euglena genus. Freshwater relatives of the Euglena genus include the fan-shaped Phacus with a hard periderm and the urn-shaped Trachelomonas , while marine or brackish water relatives include Eutreptia with two equal flagella and Eutreptiella with two unequal flagella. Euglena reproduce asexually by splitting the body vertically in two. ... *Some of the terminology explanations that mention "Eutreptia" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…この個体は有機物を加えた培養液中で生育して増殖できることから,天然に生育する葉緑体をもたないアスタシア属Astasiaはミドリムシ属から進化の過程で生じた生物であろうと推測されている。ミドリムシ属に近縁な仲間には淡水産のものとして,かたい周皮をもつうちわ形のウチワヒゲムシPhacus,つぼ形のトックリヒゲムシTrachelomonasなどが,海産または汽水産のものとして等長の2鞭毛をもつエウトレプティアEutreptia,不等長の2鞭毛をもつエウトレプティエラEutreptiellaなどがある。ミドリムシ類の増殖は体が縦に2分裂する無性生殖によって行われる。… ※「エウトレプティア」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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