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A Gram-negative, proteorhodopsin-containing, orange pigmented, rod-shaped and strictly aerobic bacterium, designated strain AKS622T, was isolated from a glacier core collected from the coast of King George Island, Antarctica. 16S rRNA gene sequence analysis revealed that strain AKS622T was affiliated to the genus Nonlabens of the family Flavobacteriaceae and showed highest similarity to Nonlabens marinus S1-08T (97.9 %). The level of DNA–DNA relatedness between strain AKS622T and N. marinus S1-08T was 46 %. Optimal growth of strain AKS622T was observed at pH 7.0, at 15 °C and with 2.0 % NaCl. The predominant cellular fatty acids were anteiso-C15 : 0, iso-C16 : 0, iso-C16 : 0 3-OH, C17 : 0 2-OH and summed feature 3 (comprising C16 : 1ω7c and/or C16 : 1ω6c). The DNA G+C content was 37.9 mol%. The major respiratory quinone was MK-6. Phosphatidylethanolamine, four unidentified glycolipids, three unidentified aminolipids and one unidentified lipid were detected as major polar lipids. On the basis of the data from this polyphasic taxonomic study, it was concluded that strain AKS622T represents a novel species within the genus Nonlabens , for which the name Nonlabens antarcticus sp. nov. is proposed. The type strain is AKS622T ( = KCCM 43019T = JCM 14068T). Emended descriptions of N. marinus Park et al. 2012 and Nonlabens agnitus Yi and Chun 2012 are given.
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