Ultrastructural Description of Breviata anathema, N. Gen., N. Sp., the Organism Previously Studied as “Mastigamoeba invertens”
Ultrastructural Description of Breviata anathema, N. Gen., N. Sp., the Organism Previously Studied as “Mastigamoeba invertens”
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Breviata anathema、N. Gen.、N. Sp. 的超微结构描述，该生物体先前被研究为“Mastigamoeba invertens”
DOI：
10.1111/j.1550-7408.2005.00087.x
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发表时间：
2006
影响因子：
2.2
通讯作者：
T. Martin Embley
中科院分区：
文献类型：
--
作者：
G. Walker;J. Dacks;T. Martin Embley
摘要。大规模真核生物进化的理解开始结晶，分子和形态学数据表明，真核生物分为六个主要群体。然而，有几个分类群的亲缘关系尚未得到解决，只有分子或形态学数据。其中之一是变形虫鞭毛虫Mastigamoeba invertens。这种生物最初被误认为是一种浮游生物，并使用分子数据进行了研究。我们提出了其第一光显微镜和超微结构表征。我们证明，它没有表现出亲和力的变形虫pelobionts，因为不像pelobionts，它有一个双基体和两个鞭毛根，一个经典的高尔基堆栈，和一个大的分支双膜结合的细胞器。小亚基核糖体RNA的系统发育分析表明与apusomonads的亲和力，当使用率异质性的协变量校正。我们认为，以前的分子结果已受到人为因素从一个不充分的校正率异质性。我们提出了一个新的名称为分类单元，Breviata anathema;和无排名，基于类形的名称“Breviates”Breviata及其近亲。
ABSTRACT. An understanding of large‐scale eukaryotic evolution is beginning to crystallise, as molecular and morphological data demonstrate that eukaryotes fall into six major groups. However, there are several taxa of which the affinities are yet to be resolved, and for which there are only either molecular or morphological data. One of these is the amoeboid flagellate Mastigamoeba invertens. This organism was originally misidentified and studied as a pelobiont using molecular data. We present its first light microscopical and ultrastructural characterisation. We demonstrate that it does not show affinities to the amoebozoan pelobionts, because unlike the pelobionts, it has a double basal body and two flagellar roots, a classical Golgi stack, and a large branching double membrane‐bound organelle. Phylogenetic analyses of small subunit ribosomal RNA suggest an affinity with the apusomonads, when a covariotide correction for rate heterogeneity is used. We suggest that previous molecular results have been subject to artefacts from an insufficient correction for rate heterogeneity. We propose a new name for the taxon, Breviata anathema; and the unranked, apomorphy‐based name “Breviates” for Breviata and its close relatives.