Ontogeny and phylogeny of Metaurostylopsis cheni sp. n. (Protozoa, Ciliophora), with estimating the systematic position of Metaurostylopsis
Ontogeny and phylogeny of Metaurostylopsis cheni sp. n. (Protozoa, Ciliophora), with estimating the systematic position of Metaurostylopsis
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Metaurostylopsis cheni sp 的个体发育和系统发育。
DOI：
10.1111/j.1463-6409.2010.00451.x
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发表时间：
2011-01-01
影响因子：
2.5
通讯作者：
Song, Weibo
中科院分区：
文献类型：
--
作者：
Chen, Xumiao;Huang, Jie;Song, Weibo
纤毛虫属Metaurostroopsis似乎是一个高度分化的海洋栖息类群，其系统位置和个体发育的变异都没有得到严格的检查。本文研究了一种新变型--陈氏偏柱新变型无性分裂过程中的形态和形态发生。N.，分离自黄海的中国，并与已知的同源物进行了比较。该新种有两种皮质颗粒，较大的皮质颗粒呈扁平、椭圆形或圆形，纵沟，黄绿色，沿环行和背部运动排列，较小的皮质颗粒无色或浅灰色，稀疏分布。其主要形态发生特征是：(I)整个亲缘纤毛，包括旧的口腔器官被更新，(Ii)Proter的口腔原基起源于口腔表面之下，即亚无运动，(Iii)边缘列和背部运动的原基是在运动内形成的，(Iv)大核结节的融合导致不规则的团块，仅有少数分支。对陈氏分枝杆菌小亚单位核糖体RNA(SSU RRNA)基因进行了序列测定。基于SSU rRNA基因序列的系统发育分析表明，陈氏沼虾与其他所有新种聚为一类。到目前为止的测序结果表明，该属是单系进化的，可能与Apokeronopsis-Thigmokeronopsis-Group密切相关，属于Urostilida目。
The ciliate genus Metaurostylopsis seems to be a highly divergent marine-habiting group, of which neither systematic position nor the variation of their ontogeny has been critically checked. In the present work, the morphology and morphogenesis during asexual division of a new form, Metaurostylopsis cheni sp. n., isolated from the Yellow Sea, China, were investigated and comparison among known congeners was performed. The new species has two types of cortical granules, the larger ones of which are flattened and oval or circular in outline with a longitudinal groove, yellow-green in colour, and arranged along the cirral rows and dorsal kineties, whereas the smaller ones are colourless or grayish and sparsely distributed. The main morphogenetic features are: (i) the entire parental ciliature, including the old oral apparatus, is renewed, (ii) the oral primordium of the proter originates de novo and beneath the surface of the buccal cavity, that is, sub-apokinetally, (iii) the anlagen of the marginal rows and of the dorsal kineties are formed intrakinetally and (iv) fusion of the macronuclear nodules results in an irregular mass with only few branches. The small subunit ribosomal RNA (SSU rRNA) gene of M. cheni was sequenced. Phylogenetic analysis based on SSU rRNA gene sequence data shows that M. cheni clusters with all other Metaurostylopsis spp. sequenced to date indicating that the genus is monophyletic and is probably closely related to the Apokeronopsis-Thigmokeronopsis-group, within the order Urostylida.