Re-evaluation of the phylogenetic position of the genus Dexiotrichides (Protozoa, Ciliophora Scuticociliatida) inferred from stomatogenetic and molecular information for Dexiotrichides pangi
Re-evaluation of the phylogenetic position of the genus Dexiotrichides (Protozoa, Ciliophora Scuticociliatida) inferred from stomatogenetic and molecular information for Dexiotrichides pangi
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DOI：
10.1080/10020070512331342790
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发表时间：
2005-08
期刊：
影响因子：
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通讯作者：
S. Weibo;A. Warren;D. Roberts;Shan Huimin;Ma Hong-wei;N. Wilbert;M. Miao;Yi Zhen-zhen
中科院分区：
文献类型：
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作者：
S. Weibo;A. Warren;D. Roberts;Shan Huimin;Ma Hong-wei;N. Wilbert;M. Miao;Yi Zhen-zhen
摘要研究了海洋盾纤毛类Dexiotrichides pangi的分异过程和系统位置。根据气孔发生学资料和18 S rDNA基因序列，对该分类群及其它相关属的气孔发生和形态发生特征进行了分析和讨论。分子生物学数据和划分事件都表明，该种/属与Dexiotricha复合体中的某些属一起，处于四膜虫和“典型的”scuticociliate之间的中间位置，这表明Dexiotricha类分类群应该被排除在“真正的”scuticociliates之外。作为进一步的贡献，D. pangi的主要特征如下：（1）后口部的口原基是由盾板区的基体增殖形成的，然后由基体增殖形成三层膜，而新的口旁膜则是由体动1的亚前部产生的。（2）后口部的口原基是由盾板区的基体增殖形成的。
Abstract The divisional process and systematic position of the marine scuticociliate Dexiotrichides pangi are studied. Based on both stomatogenetic data and 18S rDNA gene sequences, the phylogeny and morphogenetic characteristics of this taxon, and of other related genera, are analyzed and discussed. Both the divisionary events and the molecular biological data indicate that this species/genus, together with certain other genera in the Dexiotricha-complex, occupies an intermediate position between the tetrahymenids and the “typical” scuticociliate∼ which suggests that the Dexiotricha-like taxa should be excluded from the “true” scuticociliates. As a further contribution, the process of stomatogenesis in D. pangi can be summarized as follows: (1) The oral primordia in the opisthe are formed only by the proliferation of basal bodies in the scutica field, which subsequently develop into three membranelles, while the new paroral membrane seems to be generated by the sub-anterior portion of somatic kinety 1 (t...