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<p>As typical planktonic ciliates, species of the genus <i>Cyclotrichium</i> Meunier, 1910 remain poorly known in terms of their diversity, taxonomy, and evolution. In this study, two <i>Cyclotrichium</i> species, <i>C. cyclokaryon</i> Meunier, 1910 and <i>C. dayaense</i> n. sp., isolated from the coast of southern China, are reported. The morphology of both species is described based on observations of living cells and protargol staining. The diagnosis of <i>C. cyclokaryon</i> is improved by the provision of additional morphological characteristics. Comparison among related populations suggests that the Qingdao morphotype described by Xu <i>et al.</i> (2005) as <i>C. cyclokaryon</i> is not conspecific with the original form and is therefore recognized as a new member of this genus, <i>C. sinicum</i> n. sp. Another new species, <i>C. dayaense</i> n. sp., is distinguished from its congeners by a combination of features, including an ovoid body shape with an anterior protrusion, an anterior portion of the somatic kinety consisting of kinetosomal fragments, and the presence of a caudal tuft with basal bodies densely arranged in kinetosomal fragments. A key to all known <i>Cyclotrichium</i> species is provided. Molecular phylogeny analyses based on SSU rDNA sequence data support previous inferences that <i>Cyclotrichium</i> should be removed from Litostomatea; however, its final class-level affiliation remains to be investigated.</p>

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Taxonomy and Phylogeny of the Little-Known Ciliate Genus Cyclotrichium: With Special Reference to Two New Species

  • 期刊论文

  • 发表日期：

    2026年5月13日

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  • Zijun Cheng,
  • Bowen Ye,
  • Gang Li,
  • Xiping Lian,
  • Yehui Tan,
  • Xiaofeng Lin,
  • Weiwei Liu

摘要

As typical planktonic ciliates, species of the genus Cyclotrichium Meunier, 1910 remain poorly known in terms of their diversity, taxonomy, and evolution. In this study, two Cyclotrichium species, C. cyclokaryon Meunier, 1910 and C. dayaense n. sp., isolated from the coast of southern China, are reported. The morphology of both species is described based on observations of living cells and protargol staining. The diagnosis of C. cyclokaryon is improved by the provision of additional morphological characteristics. Comparison among related populations suggests that the Qingdao morphotype described by Xu et al. (2005) as C. cyclokaryon is not conspecific with the original form and is therefore recognized as a new member of this genus, C. sinicum n. sp. Another new species, C. dayaense n. sp., is distinguished from its congeners by a combination of features, including an ovoid body shape with an anterior protrusion, an anterior portion of the somatic kinety consisting of kinetosomal fragments, and the presence of a caudal tuft with basal bodies densely arranged in kinetosomal fragments. A key to all known Cyclotrichium species is provided. Molecular phylogeny analyses based on SSU rDNA sequence data support previous inferences that Cyclotrichium should be removed from Litostomatea; however, its final class-level affiliation remains to be investigated.