Poseidonibacter antarcticus sp. nov., isolated from Antarctic intertidal sediment

A Gram-reaction-negative, aerobic, flagellated and coccoid-shaped bacterial strain, designated SM1702 T , was isolated from Antarctic intertidal sediment collected off Ardely Island, West Antarctica. The strain grew at 0-30 °C and with 0.5-5.0 % (w/v) NaCl. Phylogenetic analysis based on 16S rRNA gene sequences and single-copy orthologous clusters both showed that strain SM1702 T , together with Poseidonibacter lekithochrous , occupied an independent phylogenetic branch, sharing the highest 16S rRNA gene sequence similarity with type strain of the latter (95.6 %). The major fatty acids were summed feature 3 (C 16 : 1 ω 7 c and/or C 16 : 1 ω 6 c ), summed feature 8 (C 18 : 1 ω 7 c and/or C 18 : 1 ω 6 c ), C 16 : 0 , and summed feature 2 (C 14 : 0 3-OH and/or iso-C 16 : 1 I). Polar lipids were phosphatidylethanolamine and phosphatidylglycerol. The genomic DNA G+C content of strain SM1702 T was 27.1 mol%. Based on the results of the polyphasic characterisation for strain SM1702 T , it is identified as the representative of a novel species of Poseidonibacter , for which the name Poseidonibacter antarcticus sp. nov. is proposed. The type strain of Poseidonibacter antarcticus is SM1702 T (=MCCC 1K03471 T =KCTC 62796 T ).