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      Taxonomy and Phylogeny of a New Marine Planktonic Ciliate, Strombidium pseudorapulum sp. n. (Protozoa, Ciliophora, Oligotrichia)

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          As one of the main groups of marine planktonic protozoa, oligotrich ciliates have shown a high biodiversity. Recently, a new aloricate oligotrich ciliate, Strombidium pseudorapulum sp. n. was isolated from coastal waters of southeast China. The living morphology and infraciliature of this species were studied using live cell observation and protargol impregnation. Strombidium pseudorapulum sp. n. differs from its congeners by having a radish-like body with a bumped anterior end and an elongated tail-like posterior end, possessing a red ‘eyespot’ in apical protrusion of cell, adoral zone of membranelles composed of 12–16 collar and 9–12 buccal membranelles, one spindle-shaped macronucleus, girdle kinety in anterior 2/5 of cell with 45–60 densely spaced dikinetids, and ventral kinety occupying about the posterior 1/3 of the cell with 16–19 dikinetids. Strombidium pseudorapulum sp. n. clusters together with those species having ‘eyespot’ in apical protrusion in the phylogenetic tree based on the small subunit rRNA gene sequence. It is a sister species of S. cuneiforme with 31 unmatched nucleotides between their SSU rRNA gene sequences.

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          Author and article information

          Journal of Ocean University of China
          Science Press and Springer (China )
          10 July 2020
          01 August 2020
          : 19
          : 4
          : 954-960
          1Laboratory of Protozoology, Guangzhou Key Laboratory of Subtropical Biodiversity and Biomonitoring, College of Life Science, South China Normal University, Guangzhou 510631, China
          2Key Laboratory of Tropical Marine Bio-Resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Science, Guangzhou, 510301, China
          3Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, 511458, China
          4Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou 510301, China
          5Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystem, College of the Environment and Ecology, Xiamen University, Xiamen 361005, China
          Author notes
          *Corresponding authors: LIU Weiwei, E-mail: wwliu@ ; LIN Xiaofeng, E-mail: linxf@
          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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