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.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (No. 31761133001), the Guangdong MEPP Fund (No. GDOE (2019) A23), the Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) (No. GML2019ZD0405), and Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences (No. ISEE 2018PY01).
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Li, F., Huang, Y., Yu, Y. et al. Taxonomy and Phylogeny of a New Marine Planktonic Ciliate, Strombidium pseudorapulum sp. n. (Protozoa, Ciliophora, Oligotrichia). J. Ocean Univ. China 19, 954–960 (2020). https://doi.org/10.1007/s11802-020-4402-8
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DOI: https://doi.org/10.1007/s11802-020-4402-8