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

Abstract

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.

Journal

Journal ID (publisher-id): JOUC

Title: Journal of Ocean University of China

Publisher: Science Press and Springer (China )

ISSN (Electronic): 1672-5182

Publication date (Electronic): 10 July 2020

Publication date (Print): 01 August 2020

Volume: 19

Issue: 4

Pages: 954-960

Affiliations

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@ 123456scsio.ac.cn ; LIN Xiaofeng, E-mail: linxf@ 123456xmu.edu.cn

Article

Publisher ID: s11802-020-4402-8

DOI: 10.1007/s11802-020-4402-8

Copyright statement: Copyright © Ocean University of China, Science Press and Springer-Verlag GmbH Germany 2020.

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