Yabuki Akinori, Ishida Ken-Ichiro
Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima, Yokosuka, Kanagawa, 237-0061, Japan.
Faculty of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8572, Japan.
J Eukaryot Microbiol. 2018 Jul;65(5):729-732. doi: 10.1111/jeu.12502. Epub 2018 Feb 2.
Quadricilia rotundata is a heterotrophic flagellate with four flagella. However, because this species has no clear morphological characteristics or molecular data affiliating it with any known group, Q. rotundata has been treated as a protist incertae sedis, for a long time. Here, we established a clonal culture of Q. rotundata and sequenced its 18S rDNA sequence. Molecular phylogenetic analysis successfully placed Q. rotundata in an environmental clade within Cercozoa, which contributes to expand the morphological and species diversity within Cercozoa. We also discuss morphological evolution within Cercozoa based on this finding.
圆四鞭毛虫是一种具有四条鞭毛的异养鞭毛虫。然而，由于该物种没有明确的形态特征或分子数据将其与任何已知类群联系起来，长期以来，圆四鞭毛虫一直被视为分类地位不确定的原生生物。在此，我们建立了圆四鞭毛虫的克隆培养物，并对其18S rDNA序列进行了测序。分子系统发育分析成功地将圆四鞭毛虫置于丝足虫纲内的一个环境分支中，这有助于扩大丝足虫纲内的形态和物种多样性。我们还基于这一发现讨论了丝足虫纲内的形态进化。
