%0 Journal Article %A Hwang, Yeon Ju %A Jang, Gwang Il %A Cho, Byung Cheol %A Lee, Jae Il %A Hwang, Chung Yeon %T Shewanella psychromarinicola sp. nov., a psychrophilic bacterium isolated from pelagic sediment of the Ross Sea (Antarctica), and reclassification of Shewanella arctica Kim et al. 2012 as a later heterotypic synonym of Shewanella frigidimarina Bowman et al. 1997 %D 2019 %J International Journal of Systematic and Evolutionary Microbiology, %V 69 %N 8 %P 2415-2423 %@ 1466-5034 %R https://doi.org/10.1099/ijsem.0.003490 %K psychrophilic %K Shewanella psychromarinicola %K new species %K Antarctic %K pelagic sediment %I Microbiology Society, %X Two Gram-stain-negative, rod-shaped, facultatively anaerobic, iron-reducing bacterial strains, designated M2T and R106, were isolated from pelagic surface-sediment of the Ross Sea, Antarctica. The 16S rRNA gene sequence analysis revealed that strains M2T and R106 were affiliated to the genus Shewanella and formed a distinct subline in a robust clade encompassing Shewanella vesiculosa , Shewanella livingstonensis , Shewanella arctica and Shewanella frigidimarina with a range of sequence similarities of 98.1–98.9 %. Overall genome relatedness indices indicated that M2T and R106 represented a single genomic species, which was clearly distinguishable from the phylogenetically close relatives with lower values of species delineation thresholds. Cells of M2T grew optimally at 10–15 °C and pH 6.5 in the presence of 3.0–4.0 % (w/v) sea salts. The polar lipids of M2T comprised phosphatidylglycerol, phosphatidylethanolamine, two unidentified aminophospholipids, an unidentified aminolipid and an unidentified phospholipid. Quinones were Q-7, Q-8, MK-7 and MMK-7. The major cellular fatty acids (>10 %) were C16 : 1ω7c and/or C16 : 1ω6c, C16 : 0 and C17 : 1ω8c. The DNA G+C content was 42.2 mol%. On the basis of the phenotypic, phylogenetic, genomic and chemotaxonomic features, we propose the name Shewanella psychromarinicola sp. nov. with the type strain M2T (=KCCM 43257T =JCM 32090T) and the reclassification of S. arctica as a later heterotypic synonym of S. frigidimarina . %U https://www.microbiologyresearch.org/content/journal/ijsem/10.1099/ijsem.0.003490