The katablepharids are a distant sister group of the Cryptophyta: A proposal for Katablepharidophyta divisio nova/Kathablepharida phylum novum based on SSU rDNA and beta-tubulin phylogeny
The katablepharids are a distant sister group of the Cryptophyta: A proposal for Katablepharidophyta divisio nova/Kathablepharida phylum novum based on SSU rDNA and beta-tubulin phylogeny
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DOI：
10.1016/j.protis.2004.12.003
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发表时间：
2005-08-01
期刊：
影响因子：
2.5
通讯作者：
Inouye, I
中科院分区：
文献类型：
--
作者：
Okamoto, N;Inouye, I
鳞鞭毛虫是一种在形态上定义明确的异养鞭毛虫群。自1939年首次被描述以来，基于它们相似的细胞形状、鞭毛方向和光镜下可见的弹射体的存在，它们被归类为隐藻科（隐藻门）。然而，电子显微镜显示katablepharids不同于隐孢子虫。有一种可能与肺泡虫有亲缘关系，这主要是基于它们的进食器具与尖复合体或纤毛虫的触手相似。在这项研究中，我们首次提供了两种Katablepharis japonica sp. 11和Leucocryptos marina的SSU rDNA和β -微管蛋白分子序列数据。结果表明，表咽门与牙槽门的亲缘关系并不密切；相反，SSU rDNA和β -微管蛋白的系统发育重建分析表明，katablephids是隐门的远亲姐妹群。因此，我们认为Katablepharidophytei division nova (ICBN)/Kathablepharida phylum novum （ICZN）是一个与隐生植物相同的类群。(c) 2005 Elsevier GmbH版权所有。
The katablepharids are a morphologically well-defined group of heterotrophic flagellates. Since their original description in 1939, they have been classified in the Cryptophyceae (Cryptophyta) based on their similar cell shape:, flagellar orientation, and the presence of ejectisomes visible by light microscopy. However, electron microscopy suggests that the katablepharids are distinct from cryptomonads. A possible affinity with the Alveolata has been proposed which is mainly based on the resemblance of their feeding apparatus to the apical complex of the Apicomplexa or to the tentacles of the Ciliophora. In this study, we provide the first SSU rDNA and beta-tubulin molecular sequence data for two katablepharids: Katablepharis japonica sp. nov. and Leucocryptos marina. We reveal that the katablepharids are not closely related to the Alveolata; rather, phylogenetic reconstruction analyses of SSU rDNA and beta-tubulin suggest that the katablepharids are a distant sister group of the Cryptophyta. We therefore conclude that the katablepharids should be a group equivalent to the Cryptophyta and propose Katablepharidophytei divisio nova (ICBN)/Kathablepharida phylum novum (ICZN). (c) 2005 Elsevier GmbH. All rights reserved.