We describe three coccoid green algal strains belonging to a new genus and species, Marinichlorella kaistiae Z. Aslam, W. Shin, M. K. Kim, W.‐T. Im et S.‐T. Lee, in seawater samples from the South Sea of Korea. These strains were maintained at 25°C–30°C under a 12:12 light:dark (L:D) photoregime in an ASN‐III medium at a pH of 7.5. These strains were tolerant of high salinity (7.5% NaCl) (w/v) and temperature (40°C). Molecular phylogenetic analyses using 18S rRNA gene sequence data resolved these organisms to a clade separate from green coccoid algae with similar morphology. The DNA–DNA hybridization results demonstrated very low relatedness of these organisms to phylogenetically related species of the genera Chlorella and Parachlorella. The molar guanine + cytosine content (G + C mol%) of the genomic DNA of these organisms ranged from 64.7 to 69.1 mol%. Based on molecular phylogeny, DNA–DNA hybridization, and other morphological studies, we propose a new taxon, Marinichlorella kaistiae, to describe these strains and classify them in the family Chlorellaceae. The type strain is KAS007T (= KCTC AG10303T = IAM C‐620T).
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