Journal of Species Research

The National Institute of Biological Resources (국립생물자원관)
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New record of the cold freshwater dinoflagellate Palatinus apiculatus (Dinophyceae) from the Paldang Reservoir, Korea

  • Kim, Taehee (Department of Life Science, Sangmyung University) ;
  • Ki, Jang-Seu (Department of Life Science, Sangmyung University)
  • Received : 2022.05.17
  • Accepted : 2022.07.12
  • Published : 2022.08.31
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Abstract

Compared to marine dinoflagellates, freshwater species are rarely recorded in Korea. In the present study, we isolated a freshwater dinoflagellate, Palatinus, from the Paldang Reservoir, Korea, in December 2021. The overall cell shape was ovoid, and the cell size was 34.3 ㎛ in length (25.8-39.5 ㎛) and 28.4 ㎛ in width (21.5-34 ㎛). An eyespot was usually observed near the sulcal region. The Kofoidian plate formula of the species was determined to be 4', 2a, 7", 6c, 5s, 5''', and 2''''. Apical pore complex was not observed. However, variations in the cingular plate caused by the fusion of 3C and 4C were observed. Analyses of 28S rDNA sequences revealed that the unidentified species is 100% similar to Palatinus apiculatus, and clustered together in the same lineage in the phylogenetic tree (100% bootstrap value). Our findings confirmed that the isolated dinoflagellate is Palatinus apiculatus, which was discovered for the first time in Korean freshwaters.

Keywords

Acknowledgement

We would like to thank Dr. SD Lee for assisting in the scanning electron microscopy. This work was supported by grants from the National Institute of Biological Resources(NIBR), funded by the Ministry of Environment(MOE) of the Republic of Korea (NIBR202212103 and NIBR 202203204).

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