Maribrevibacterium harenarium gen. nov., sp. nov., represented by a marine strain of the family Oceanospirillaceae

A Gram-stain-negative, non-motile, facultatively anaerobic, short rod-shaped bacterium, designated HB171799^T, was isolated from seacoast sandy soil collected at Qishui Bay, Hainan, PR China. The chemotaxonomic analysis revealed that the respiratory quinones were Q-8 and Q-7, and the major cellular fatty acids were summed feature 8 (comprising C_18 : 1  ω7c and/or C_18 : 1  ω6c), C_16 : 0 and C_18 : 0. The major polar lipids were diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine, an unidentified phospholipid and an unidentified lipid. The size of the draft genome was 3.68 Mb with a DNA G+C content of 48.0 mol%. Results of phylogenetic analyses based on 16S rRNA gene and genome sequences showed that the novel isolate belonged to the family Oceanospirillaceae and formed a distinct subcluster at the base of the radiation of the genus Marinomonas. The highest sequence similarity (96.0 %) of the novel isolate was found to the type strains of Marinomonas fungiae JCM 18476^T and Marinomonas ostreistagni DSM23425^T. The whole genome-based phylogeny and differences in cellular fatty acids and polar lipids readily distinguished strain HB171799^T from all the closely related validly published type strains. Strain HB171799^T is therefore suggested to represent a novel species of a new genus in the family Oceanospirillaceae, for which the name Maribrevibacterium harenarium gen. nov., sp. nov. is proposed. The type strain is HB171799^T (=CGMCC 1.16727^T=JCM 33332^T).

Nitrincola iocasae sp. nov., a bacterium isolated from sediment collected at a cold seep field in the South China Sea

A novel bacterium, designated strain KXZD1103^T, was isolated from sediment collected at a cold seep field of the Formosa Ridge in the South China Sea. Cells were Gram-stain-negative, facultatively anaerobic, motile, oxidase- and catalase-positive, and grew optimally at 28 °C, pH 6.0-pH 7.0 and in the presence of 1-3 % (w/v) NaCl. The major cellular fatty acids were summed feature 8 (C_18 : 1  ω7c/C_18 : 1  ω6c), summed feature 3 (C_16 : 1  ω7c/C_16 : 1  ω6c) and C_16 : 0. The major respiratory ubiquinone was Q-8. The predominant polar lipids were diphosphatidylglycerol, phosphatidylethanolamine and phosphatidylglycerol. Analysis of 16S rRNA gene sequences revealed that strain KXZD1103^T grouped with members of the genus Nitrincola, with Nitrincola lacisaponensis 4CA^T (98.1 % sequence similarity) and Nitrincola schmidtii R4-8^T (97.7 %) as its closest neighbours. Genome sequencing revealed a genome size of 4.17 Mb and a DNA G+C content of 50.1 %. Genomic average nucleotide identity values for strain KXZD1103^T with the type strains within the genus Nitrincola ranged from 71.0 to 75.7 %, while the in silico DNA-DNA hybridization values for strain KXZD1103^T with these strains ranged from 16.1 to 21.6 %. On the basis of the results of phylogenetic, phenotypic and chemotaxonomic analyses, strain KXZD1103^T is considered to represent a novel species of the genus Nitrincola, for which the name Nitrincola iocasae sp. nov. is proposed. The type strain is KXZD1103^T (=KCTC 72678^T=MCCC 1K04283^T).

Nitrincola tapanii sp. nov., a novel alkaliphilic bacterium from An Indian Soda Lake

A novel Gram-stain-negative bacterial strain designated as MEB193^T was isolated from a sediment sample collected from Lonar Lake, India. The cells were motile, non-spore-forming and rod-shaped. The strain was oxidase- and catalase-positive. It grew optimally at pH 9.0 and at 1 % (w/v) NaCl concentration at 30 °C. Based on 16S rRNA gene sequence similarity, MEB193^T belongs to genus Nitrincola, with Nitrincola alkalilacustris ZV-19^T (95.89 %) and Nitrincola lacisaponensis 4CA^T (95.87 %) as its closest neighbours. The major fatty acid was summed feature 8 comprising C_18:1ω7c/C_18:1ω6c (52 %) followed by C_16 : 0 (25 %). Phosphatidylglycerol (PG) and diphosphatidylglycerol (DPG) were present as the major polar lipids. The draft genome obtained in this study was 2 793 747 bp and the G+C content was 50.79 mol%. Average nucleotide identity (71.76 %) and DNA-DNA hybridization (<20 %) values between strain MEB193^T and Nitrincola lacisaponensis 4CA^T confirmed the novelty of this new species. Based on phenotypic including chemotaxonomic and genotypic characterization data, strain MEB193^T represents a new species of the genus Nitrincola for which the name Nitrincola tapanii sp. nov. is proposed. The type strain is MEB193^T (=MCC 2863^T=JCM 31570 ^T=KCTC 52390 ^T).