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Abstract
A Gram-stain-negative, strictly aerobic, non-motile and ovoid- or rod-shaped bacterial strain, JBTF-M29T, was isolated from tidal flat sediment sampled from the Yellow Sea, Republic of Korea. The neighbour-joining phylogenetic tree based on 16S rRNA gene sequences revealed that strain JBTF-M29T clustered with the type strains of Maribius species and this cluster joined the clade comprising Pseudomaribius and Palleronia species. Strain JBTF-M29T exhibited 16S rRNA gene sequence similarity values of 96.2–96.6 % to the type strains of three Maribius species, of 96.4 % to the type strain of Pseudomaribius aestuariivivens and of 93.9–94.7 % to the type strains of three Palleronia species. In the UPGMA dendrogram based on the ANI values of genomic sequences, strain JBTF-M29T formed an evolutionary lineage independent of the genera Maribius and Palleronia and some other taxa. Strain JBTF-M29T contained Q-10 as the predominant ubiquinone and C18 : 1 ω7c and C18 : 0 as the major fatty acids. The major polar lipids of strain JBTF-M29T were phosphatidylglycerol and one unidentified aminolipid. The DNA G+C content of strain JBTF-M29T was 64.5 mol%. The differences in fatty acid and polar lipid profiles and other differential phenotypic properties including nitrate reduction and casein hydrolysis made it reasonable to distinguish strain JBTF-M29T from the genera Maribius , Pseudomaribius and Palleronia . Therefore, on the basis of the polyphasic taxonomic data presented here, strain JBTF-M29T constitutes a new genus and species within the class Alphaproteobacteria , for which the name Paenimaribius caenipelagi gen. nov., sp. nov. is proposed. The type strain is JBTF-M29T (=KACC 19867T=NBRC 113548T).
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