Small-subunit ribosomal RNA gene sequences of Phaeodarea challenge the monophyly of Haeckel's Radiolaria.
Small-subunit ribosomal RNA gene sequences of Phaeodarea challenge the monophyly of Haeckel's Radiolaria.
复制标题
DOI：
10.1078/1434461000164
复制
发表时间：
2004-03
期刊：
影响因子：
2.5
通讯作者：
S. Polet;C. Berney;J. Fahrni;J. Pawłowski
中科院分区：
文献类型：
--
作者：
S. Polet;C. Berney;J. Fahrni;J. Pawłowski
恩斯特·海克尔（Ernst Haeckel）在其关于放射虫的专著中，最初将Phaeodarea与Polycystalia一起包括在内，这三个分类群的特征都是存在一个中央胶囊和拥有轴足。然而，细胞学和超微结构的研究，质疑的单系性的放射虫，提出了一个独立的进化起源的三个类群，和第一个分子数据的珊瑚礁和多囊藻带来了争议的结果。为了进一步验证放射虫的单系性，我们测定了三种褐壳类和三种多胱氨酸类的核糖体小亚基RNA基因的全序列。我们的分析表明，phaeodarians明确分支之间最近描述的门尾虫，分别从多囊藻和多囊藻。这一结果增强了形态的变化，在门尾藻，其中已经包含非常异质群体的原生生物。我们的研究还证实了共同的起源，形成姐妹组的尾虫，并允许系统发育的形态特征的三个放射虫组的。
In his grand monograph of Radiolaria, Ernst Haeckel originally included Phaeodarea together with Acantharea and Polycystinea, all three taxa characterized by the presence of a central capsule and the possession of axopodia. Cytological and ultrastructural studies, however, questioned the monophyly of Radiolaria, suggesting an independent evolutionary origin of the three taxa, and the first molecular data on Acantharea and Polycystinea brought controversial results. To test further the monophyly of Radiolaria, we sequenced the complete small subunit ribosomal RNA gene of three phaeodarians and three polycystines. Our analyses reveal that phaeodarians clearly branch among the recently described phylum Cercozoa, separately from Acantharea and Polycystinea. This result enhances the morphological variability within the phylum Cercozoa, which already contains very heterogeneous groups of protists. Our study also confirms the common origin of Acantharea and Polycystinea, which form a sister-group to the Cercozoa, and allows a phylogenetic reinterpretation of the morphological features of the three radiolarian groups.