Gusev Evgeniy S, Čertnerová Dora, Škaloudová Magda, Škaloud Pavel
Papanin's Institute for Biology of Inland Waters, Russian Academy of Sciences, Borok, Nekouz, Yaroslavl, 152742, Russia.
Department of Botany, Charles University, Benátská 2, Praha 2, CZ-12800, Czech Republic.
J Eukaryot Microbiol. 2018 Jan;65(1):38-47. doi: 10.1111/jeu.12427. Epub 2017 Jun 13.
A complex of closely related Mallomonas taxa belonging to the section Papillosae, M. kalinae Řezáčová and M. rasilis Dürrschmidt, has been studied in detail by molecular and morphometric methods. Our investigations uncovered the existence of a new species found in water bodies in Vietnam, which we describe here as Mallomonas furtiva sp. nov. This taxon is morphologically very similar to M. kalinae, from which it differs by minute, but statistically significant morphological differences on the structure of silica scales. Indeed, the principal component analysis of morphological traits measured on silica scales significantly separates all three species in the complex. Mallomonas kalinae and M. furtiva differ by number of papillae on the shield and the dome, as well as by the scale sizes. Likewise, Mallomonas rasilis and M. furtiva are primarily differentiated by the absence of submarginal anterior ribs on silica scales of the former species. Phylogenetic analyses showed that Mallomonas furtiva is closely related to M. kalinae, with which it formed a highly supported lineage. Distribution patterns of all three studied taxa are further discussed.
对属于乳头藻属（Papillosae）的一组密切相关的马尔莫单胞藻分类群，即卡利纳马尔莫单胞藻（Mallomonas kalinae Řezáčová）和拉西利斯马尔莫单胞藻（M. rasilis Dürrschmidt），已通过分子和形态测量方法进行了详细研究。我们的调查发现了一种在越南水体中发现的新物种，我们在此将其描述为隐秘马尔莫单胞藻（Mallomonas furtiva sp. nov.）。该分类群在形态上与卡利纳马尔莫单胞藻非常相似，但在硅质鳞片结构上存在微小但具有统计学意义的形态差异。实际上，对硅质鳞片上测量的形态特征进行主成分分析，能显著区分该复合体中的所有三个物种。卡利纳马尔莫单胞藻和隐秘马尔莫单胞藻在盾板和穹顶上的乳头数量以及鳞片大小方面存在差异。同样，拉西利斯马尔莫单胞藻和隐秘马尔莫单胞藻主要通过前者硅质鳞片上没有边缘前肋来区分。系统发育分析表明，隐秘马尔莫单胞藻与卡利纳马尔莫单胞藻密切相关，它们形成了一个得到高度支持的谱系。进一步讨论了所有三个研究分类群的分布模式。
