Xu Yuan, Pan Hongbo, Miao Miao, Hu Xiaozhong, Al-Farraj Saleh A, Al-Rasheid Khaled A S, Song Weibo
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, 200062, China; Laboratory of Protozoology, Institute of Evolution & Marine Biodiversity, Ocean University of China, Qingdao, 266003, China.
J Eukaryot Microbiol. 2015 Mar-Apr;62(2):206-16. doi: 10.1111/jeu.12162. Epub 2014 Sep 18.
The morphology and phylogeny of Loxodes vorax and L. striatus orientalis subsp. n. were investigated based on infraciliature and small subunit (SSU) rRNA gene sequence data. Loxodes striatus orientalis subsp. n. was separated from L. striatus striatus stat. n. by having fewer dikinetids in the intrabuccal kinety (35-55 vs. 50-70) and a variable number of macronuclei (2-4 vs. 2). In addition, the SSU rRNA gene sequence of the new subspecies differs in 13 and 11 nucleotides from that of two populations of the nominotypic subspecies. We also summarized the morphological differences between Loxodes and Remanella based on the data available. Phylogenetic analyses revealed that the genus Loxodes was monophyletic and nested within Remanella species. This study might, therefore, support the hypothesis that the freshwater genus Loxodes evolved from the marine genus Remanella.
基于纤毛下器和小亚基（SSU）rRNA基因序列数据，对贪婪斜管虫（Loxodes vorax）和东方条纹斜管虫（L. striatus orientalis subsp. n.）的形态学和系统发育进行了研究。东方条纹斜管虫与条纹斜管虫指名亚种（L. striatus striatus stat. n.）的区别在于，口内膜动基列中的双动基列较少（35 - 55个对50 - 70个），大核数量可变（2 - 4个对2个）。此外，新亚种的SSU rRNA基因序列与指名亚种的两个种群在13和11个核苷酸上存在差异。我们还根据现有数据总结了斜管虫属（Loxodes）和雷曼虫属（Remanella）之间的形态学差异。系统发育分析表明，斜管虫属是单系的，并嵌套在雷曼虫属物种中。因此，本研究可能支持淡水斜管虫属从海洋雷曼虫属进化而来的假说。
