This dataset contains the digitized treatments in Plazi based on the original journal article Yan, Qiufeng, Ge, Tao, Wang, Degao, Bai, Yachen, Liu, Benwen, Hu, Jifei, Zhu, Huan, Liu, Guoxiang (2026): Phylogenetic and Taxonomic study of a new aquatic alga, Pleurastrum gracilis sp. nov. (Volvocales, Chlorophyta), from the Qinghai Lake. PhytoKeys 279: 255-266, DOI: 10.3897/phytokeys.279.199681
Abstract
The species of the genus Pleurastrum are rarely mentioned, and related research and reports are limited. At present, this genus only contains 8 species, however, there is no record of this genus species in China, and there is a lack of research on its diversity. In this study, we collected two isolates of algae, FACHB- 3462 and FACHB- 3463, from lakes and freshwater rivers on the Qinghai Tibet Plateau. Based on morphological data and phylogenetic analysis, we described P. gracilis in detail and compared its similarity with the morphology of existing species. The phylogenetic tree constructed based on the 18 S rDNA sequence indicates that P. gracilis is most closely related to P. amblystomatis, P. aquaticum, and P. ellipsoideum, forming a branch independent of the genera Protosiphon, Spongiochloris, and Spongioarcinopsis. The phylogenetic analysis of ITS sequences shows that the isolates also form an independent branch. Different from other species, the isolate was found in a saline lake at a high altitude. The difference between the isolate and its sisters branch was that its cell wall was thin, and it was observed that many ellipsoid cells were connected head to tail, and it had one or more CBCs different from other species in the genus. At the same time, there was a branching structure on Helix- 1. Given these morphological differences, phylogenetic analysis results, and comparison of ITS 2 secondary structures, the isolate isolated in this study is proposed as a new species and named Pleurastrum gracilis sp. nov.
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