Laboratory of Protozoological Biodiversity and Evolution in Wetland, College of Life Sciences, Shaanxi Normal University, Xi'an, 710119, China.
Key Laboratory for Space Bioscience and Biotechnology, Institute of Special Environmental Biophysics, School of Life Sciences, Northwestern Polytechnical University, Youyi Xilu 127, 710072, Xi'an, Shaanxi, China.
Eur J Protistol. 2020 Apr;73:125666. doi: 10.1016/j.ejop.2019.125666. Epub 2020 Jan 3.
The living morphology, infraciliature, morphogenesis and phylogenetic position of a new hypotrichous ciliate, Heterourosomoida sinica n. sp., discovered in saline soil in Northwest of China, were investigated. Heterourosomoida sinica n. sp. is characterized as follows: body size about 70-95 × 20-30 μm in vivo, ellipsoid or elongate; cortical granules dark green, 0.5 μm across, arranged around dorsal cilia and in short irregular rows on ventral side; consistently 18 frontoventral-transverse cirri; left and right marginal rows composed of 17-24 and 13-21 cirri, respectively; two macronuclear nodules and one or two micronuclei. The detailed morphogenesis of a species of Heterourosomoida is reported for the first time. The ontogenesis on dorsal side is basically similar to that in Urosomoida-species and the process on ventral side is characterized by: 18 frontoventral-transverse cirri develop from six anlagen with the anlagen V and VI formed in the primary mode. Phylogenetic analyses based on SSU rDNA sequence data reveal that Heterourosomoida sinica n. sp. clusters with Kleinstyla dorsicirrata and forms a clade with the type species H. lanceolata.
本研究调查了一种新的拟纤毛原生动物——中华异毛裸口目虫（Heterourosomoida sinica n. sp.）在我国西北地区盐土中的活体形态、亚显微结构、形态发生和系统发育位置。中华异毛裸口目虫的特征如下：活体大小约为 70-95×20-30μm，呈椭圆形或长形；皮层颗粒深绿色，直径 0.5μm，排列在口面纤毛周围，在腹面呈短而不规则的行； consistently 18 条额腹横口纤毛；左、右缘毛列分别由 17-24 和 13-21 条纤毛组成；有两个大核和一个或两个小核。本文首次报道了一种异毛裸口目的详细形态发生。背面的个体发生基本上类似于 Urosomoida 种，腹面的过程特征是：18 条额腹横口纤毛由六个原基发育而来，原基 V 和 VI 以初级模式形成。基于 SSU rDNA 序列数据的系统发育分析表明，中华异毛裸口目虫与 Dorsicirrata 属的 Kleinstyla dorsicirrata 聚在一起，并与模式种 H. lanceolata 形成一个分支。
