Mesonia aestuariivivens sp. nov., isolated from a tidal flat

A Gram-negative, aerobic, non-flagellated and ovoid or rod-shaped bacterial strain (JHPTF-M18^T), which was isolated from a tidal flat sediment in Republic of Korea, was taxonomically characterized. Strain JHPTF-M18^T grew optimally at 25 °C, at pH 7.0–7.5 and in the presence of 2.0–3.0% (w/v) NaCl. 16S rRNA gene sequence analysis showed that strain JHPTF-M18^T forms a phylogenetic lineage within the radiation comprising type strains of Mesonia species. The 16S rRNA gene of strain JHPTF-M18^T shared sequence similarities of 97.7% with that of type strain of M. mobilis and 92.5–96.8% with those of type strains of the other nine Mesonia species. The DNA G+C content was 33.1% based on its genomic sequence. AAI, ANI and dDDH values between strain JHPTF-M18^T and the type strains of M. mobilis, M. hitae, M. oceanica, M. phycicola and M. algae were 72.1–83.7%, 73.1–79.7% and 18.5–22.8%, respectively. Strain JHPTF-M18^T contained MK-6 as the predominant menaquinone and iso-C_15:0, iso-C_17:0 3-OH and summed feature 3 (C_16:1ω7c and/or C_16:1ω6c) as its major fatty acids. Major polar lipids of strain JHPTF-M18^T were phosphatidylethanolamine and two unidentified lipids. Strain JHPTF-M18^T was separated from recognized Mesonia species by its phenotypic properties together with the phylogenetic and genetic distinctiveness. Based on data presented in this study, strain JHPTF-M18^T is considered to represent a novel species of the genus Mesonia. The name Mesonia aestuariivivens sp. nov. is proposed for JHPTF-M18^T (=KACC 22185^T = NBRC 115119^T).