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 ω7c and/or C_16 : 1 ω6c), summed feature 8 (C_18 : 1 ω7c and/or C_18 : 1 ω6c), 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).