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      The Morphology and Phylogeny of Three Diophrys Ciliates Collected from the Subtropical Waters of China, Including a New Species (Ciliophora; Euplotia)

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          Abstract

          Three Diophrys species, D. quadrinucleata n. sp., D. oligothrix Borror, 1965 and D. scutum (Dujardin, 1841) Kahl, 1932, were identified from the subtropical brackish waters in China, their morphology was investigated using live observation and protargol impregnation. D. quadrinucleata n. sp. can be distinguished from the congeners by four ellipsoidal macronuclear nodules. Phylogenetic analyses show that the three species with single marginal cirrus are closely related, namely D. quadrinucleata n. sp., D. apoligothrix Song et al., 2009 and D. japonica Hu, 2008. Our population of D. oligothrix corresponds very well with previous populations in both living morphology and ciliature. However, the SSU rDNA sequences of three well-described populations differ from each other by 11 to 18 nucleotides, indicating that there might be cryptic species in D. oligothrix. Moreover, we provided a detailed description of the symbiotic bacteria/archaeobacteria (?) concentrated on the back surface of D. scutum based on the present population, which was either overlooked or misinterpreted as cortical granules previously.

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          Author and article information

          Journal
          JOUC
          Journal of Ocean University of China
          Science Press and Springer (China )
          1672-5182
          10 July 2020
          01 August 2020
          : 19
          : 4
          : 975-987
          Affiliations
          1School of Marine Sciences, Ningbo University, Ningbo 315211, China
          2Key Laboratory of Aquatic Biodiversity and Conservation of Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
          3Institute of Evolution and Marine Biodiversity, Ocean University of China, Qingdao 266003, China
          4College of Fisheries, Ocean University of China, Qingdao 266003, China
          Author notes
          *Corresponding author: CHEN Xiangrui, E-mail: xiangruichen@ 123456126.com

          # The two authors contributed equally to this work.

          Article
          s11802-020-4536-8
          10.1007/s11802-020-4536-8
          Copyright © Ocean University of China, Science Press and Springer-Verlag GmbH Germany 2020.

          The copyright to this article, including any graphic elements therein (e.g. illustrations, charts, moving images), is hereby assigned for good and valuable consideration to the editorial office of Journal of Ocean University of China, Science Press and Springer effective if and when the article is accepted for publication and to the extent assignable if assignability is restricted for by applicable law or regulations (e.g. for U.S. government or crown employees).

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          Self URI (journal-page): https://www.springer.com/journal/11802

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