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The Korean Society of Phycology (한국조류학회(藻類))
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Morphological observations and phylogenetic position of the parasitoid nanoflagellate Pseudopirsonia sp. (Cercozoa) infecting the marine diatom Coscinodiscus wailesii (Bacillariophyta)

  • Kim, Sunju (Department of Oceanography, Pukyong National University) ;
  • Jeon, Chang Beom (LOHABE, Department of Oceanography, Chonnam National University) ;
  • Park, Myung Gil (LOHABE, Department of Oceanography, Chonnam National University)
  • Received : 2017.05.20
  • Accepted : 2017.07.28
  • Published : 2017.09.30
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Abstract

During a sampling at Nokdong harbor, southern coast of Korea in January 2017, the marine diatom Coscinodiscus wailesii cells infected by a novel parasitoid nanoflagellate were observed. While the development process of the trophosomes of the parasitoid was more similar to that of Pseudopirsonia mucosa, division pattern of the auxosomes was similar to that of Pirsonia species. Phylogenetic analyses inferred from 18S rRNA gene sequences revealed that the parasitoid infecting C. wailesii fell within the cercozoan groups and branched as a sister lineage of the clade consisting of Pseudopirsonia mucosa and the undescribed Cercomonas sp. SIC7235, with the sequence dissimilarity of 7.3% with Pseudopirsonia mucosa. All of these developmental and molecular characteristics suggest that the parasitoid nanoflagellate infecting the diatom C. wailesii is a new Pseudopirsonia species.

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References

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