淡水刚毛藻目一新组合种及其系统发育分析

作者于2012-2014年先后在湖北省采集到4株刚毛藻目的丝状绿藻。经鉴定,其形态特征和莫拉瓦刚毛藻Cladophora moravica Gardavsk(1986)非常相似;但相较于刚毛藻属各个种的形态,4株藻体更接近黑孢藻科的分类特征。基于SSU和LSU rDNA序列构建的系统发育树显示,4株刚毛藻目的丝状绿藻均属于黑孢藻科拟湖球藻属(Aegagropilopsis)。据此,作者建议将该种名称作为一个新组合处理,即莫拉瓦拟湖球藻Aegagropilopsis moravica(Dvoˇrák)Zhao et Liu com.nov。拟湖球藻属仅含有3个种:莫拉瓦拟湖球藻、硬枝拟湖球藻和棒状拟湖球藻,其形态特征与湖球藻相近且易混淆,故采用核基因组序列分析方法区分二者是非常有效的。

A New Combination Species of Freshwater Cladophorales and Its Phylogenetic Analysis

Four filamentous green algal samples of Cladophorales were collected from Hubei Province during 2012-2014. The four specimens had a morphology very similar to that of Cladophora moravica Gardavský (1986). These algae were more closely related to species of Pithophoraceae than to other Cladophora species. Phylogenetic analysis based on SSU and LSU rDNA sequences indicated that all four samples belonged to the clade of Aegagropilopsis, which is a distinct genus in Pithophoraceae. Thus, a new combination-Aegagropilopsis moravica (Dvo?ák) Zhao et Liu com. nov. - was proposed. Currently, with only three species (Aegagropilopsis moravica, Aegagropilopsis sterrocladia and Aegagropilopsis clavuligera), Aegagropilopsis is easily morphologically confused with Aegagropila species. Therefore, nuclear genome sequence analysis would be an efficient method to solve this problem.