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KMID : 0364820200560020146
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Korean Journal of Microbiology
2020 Volume.56 No. 2 p.146 ~ p.151
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New record of the dinoflagellate Unruhdinium penardii var. robustum (Dinophyceae) from Paldang Reservoir, Korea
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Kim Tae-Hee
Lee Yeon-Su
Ki Jang-Seu
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Abstract
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We described for the first time the freshwater dinoflagellate Unruhdinium penardii var. robustum, collected from Paldang
Reservoir, Korea, on October 21, 2019. The overall shape was pentagonal to rhombic. The cell size was 31 μm in length
(23~39 μm), and 29 μm in width (23~38 μm). Their plate formula was determined to 4', 0a, 6'', 5''', 0p, and 2''''; and the apical plate was symmetric. Two apical spines were prominent, and approximately 6 robust hypothecal spines were observed. Molecular comparisons of the 18S rDNA sequences showed that our species was well-matched with the already-known U. penardii (99.9% similarity); because U. penardii var. robustum 18S rDNA sequence was not available in the public database. Additional 28S rDNA sequences had high similarity with already-known U. penardii var. robustum (99.8% similarity). These morphological and molecular results confirmed that our dinoflagellate was clearly U. penardii var. robustum, and it was recorded for the first time in Korean freshwaters.
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KEYWORD
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Unruhdinium penardii, 18S rDNA, freshwater dinoflagellate, morphology, Paldang Reservoir
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