Laboratory of Protozoology, Institute of Evolution and Marine Biodiversity, Ocean University of China, Qingdao, 266003, China.
Key Laboratory of Aquatic Biodiversity and Conservation of Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China.
J Eukaryot Microbiol. 2020 Jan;67(1):76-85. doi: 10.1111/jeu.12756. Epub 2019 Sep 19.
We report the morphology and morphogenesis of Urosoma caudata (Ehrenberg, 1833) Berger, 1999 based on in vivo observation and protargol impregnation and provide an improved diagnosis of U. caudata based on previous and current work. Urosoma caudata differs from its congeners mainly by the combination of the following features: tail-like posterior end, colorless cortical granules, and two macronuclear nodules. Urosoma caudata shares most of the ontogenetic features with its congeners: the oral primordium of the opisthe develops apokinetally, and the frontal-ventral-transverse cirral anlagen develop in five streaks. However, a unique morphogenetic characteristic is recognizable: the anlagen of three dorsal kineties occur de novo to the left of the parental structures differing from their intrakinetal origin in other Urosoma species. The first record of the 18S rRNA gene sequence for the species is also provided. Phylogenetic analyses based on 18S rRNA gene sequence data suggest that the genus Urosoma is a nonmonophyletic group.
我们根据体内观察和蛋白银浸染的结果，报告了 Urosoma caudata（Ehrenberg，1833） Berger，1999 的形态和形态发生，并根据以前和现在的工作对 U. caudata 进行了改进的诊断。Urosoma caudata 与其同属种的主要区别在于以下特征的组合：尾状后端、无色皮质颗粒和两个大核结节。Urosoma caudata 与同属种共享大多数个体发生特征：后口原基逆行发育，额腹横纤毛原基呈五条纹状发育。然而，可识别出一个独特的形态发生特征：三个背纤毛体的原基是从头发生的，不同于其他 Urosoma 物种的体内核起源。还提供了该物种 18S rRNA 基因序列的第一个记录。基于 18S rRNA 基因序列数据的系统发育分析表明，Urosoma 属是一个非单系群。
