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<p>The taxonomic basis of the genus <i>Anthophysa</i> has remained unclear since its establishment in 1822. Only one partial LSU rDNA sequence is available to date, and its taxonomic position in the Chrysophyceae remains largely unknown. We combined morphological characteristics with newly acquired molecular evidence, including the nuclear SSU, ITS, and complete LSU rDNA, and identified two strains of the genus <i>Anthophysa</i> collected from Xizang and Shanghai, China. Distinguishing species within this genus based solely on morphological characteristics was found quite challenging, as the two strains were morphologically extremely similar. The phylogenetic trees constructed based on the LSU single gene and the SSU, ITS, and LSU multiple genes supported the identification of the specimen from Xizang as <i>Anthophysa baimaiquensis</i> sp. nov. and that from Shanghai as <i>A. shanghaiensis</i> sp. nov. Moreover, the taxonomic position of the genus <i>Anthophysa</i> within the class Chrysophyceae and its topological position on the phylogenetic tree were clarified. We identified the origin of <i>Anthophysa</i> through Bayesian relaxed-clock analysis, thereby providing an important temporal basis for reconstructing the evolutionary history of <i>Anthophysa</i>.</p>

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New molecular sequences illuminate two new Anthophysa species (Chrysophyceae, Ochromonadales) from China: integrating phylogenetic and morphological evidence

  • 期刊论文

  • 发表日期：

    2026年5月12日

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  • Yalu An,
  • Junxue Hao,
  • Fangru Nan,
  • Qi Liu,
  • Xudong Liu,
  • Shulian Xie,
  • Jia Feng

摘要

The taxonomic basis of the genus Anthophysa has remained unclear since its establishment in 1822. Only one partial LSU rDNA sequence is available to date, and its taxonomic position in the Chrysophyceae remains largely unknown. We combined morphological characteristics with newly acquired molecular evidence, including the nuclear SSU, ITS, and complete LSU rDNA, and identified two strains of the genus Anthophysa collected from Xizang and Shanghai, China. Distinguishing species within this genus based solely on morphological characteristics was found quite challenging, as the two strains were morphologically extremely similar. The phylogenetic trees constructed based on the LSU single gene and the SSU, ITS, and LSU multiple genes supported the identification of the specimen from Xizang as Anthophysa baimaiquensis sp. nov. and that from Shanghai as A. shanghaiensis sp. nov. Moreover, the taxonomic position of the genus Anthophysa within the class Chrysophyceae and its topological position on the phylogenetic tree were clarified. We identified the origin of Anthophysa through Bayesian relaxed-clock analysis, thereby providing an important temporal basis for reconstructing the evolutionary history of Anthophysa.