Zhang Tengteng, Wang Jingyi, Lyu Zhao, Wang Yurui, Al-Rasheid Khaled A, Shao Chen
Laboratory of Protozoological Biodiversity and Evolution in Wetland, College of Life Sciences, Shaanxi Normal University, Xi'an 710119, China.
College of Life Sciences, Northwest University, Xi'an 710069, China.
Eur J Protistol. 2022 Oct;86:125934. doi: 10.1016/j.ejop.2022.125934. Epub 2022 Oct 13.
The living morphology, infraciliature, morphogenesis and phylogenetic position of a new soil ciliate, Bistichella sinensis n. sp. collected from Northwest of China, were investigated. The new species is characterized by an elongate-oval body, two macronuclear nodules, colourless cortical granules, three frontal and three or four buccal cirri, three frontal rows with 7-10 cirri in total, and usually-two frontoventral rows with the left one usually terminating at 90% down length of body. The main morphogenetic features of the novel species are as follows: (1) the posterior part of the parental adoral zone is renewed; (2) frontal-ventral cirral anlagen III to V each forms a frontal row, and anlagen VI to n each produces a frontoventral row; (3) marginal rows and dorsal kineties develop intrakinetally. Furthermore, the phylogenetic analyses based on small subunit ribosomal DNA reveal close relationship between Bistichella sinensis n. sp., Parabistichella, Uroleptoides, Lamtostyla, Keronopsis, Paraholosticha and Orthoamphisiella. The in vivo morphology and the infraciliature of the Chinese populations of Monomicrocaryon euglenivorum fimbricirratum and Laurentiella strenua are basically identical to previous descriptions. Improved diagnoses for M. euglenivorum and its two subspecies, as well as a redescription of a Chinese population of L. strenua are supplied.
对从中国西北部采集的一种新的土壤纤毛虫——中华双壁虫（Bistichella sinensis n. sp.）的活体形态、纤毛下器、形态发生及系统发育位置进行了研究。新物种的特征为：体呈长椭圆形，有两个大核结节，无色皮质颗粒，3根额纤毛和3或4根口纤毛，3排额纤毛共7 - 10根，通常有两排额腹纤毛，左侧一排通常在体长的90%处终止。该新物种的主要形态发生特征如下：(1)亲代口围带的后部更新；(2)额腹纤毛原基III至V各形成一排额纤毛，原基VI至n各产生一排额腹纤毛；(3)边缘列和背动基列在动基体内发育。此外，基于小亚基核糖体DNA的系统发育分析表明，中华双壁虫新物种与副双壁虫、尾柱虫属、长柱虫属、凯伦柱虫、副全列虫、正双栖虫属关系密切。中国种群的细单毛虫 Euglenivorum fimbricirratum 和强壮劳伦虫的活体形态和纤毛下器与之前的描述基本一致。提供了对 Euglenivorum 及其两个亚种的改进诊断，以及对中国强壮劳伦虫种群的重新描述。
