gen. nov., sp. nov., isolated from estuary sediment.

A Gram-negative, aerobic, non-flagellated and ovoid- or rod-shaped bacterium, designated strain SM1902, was isolated from the sediment sampled at the Jia River estuary, Yantai, PR China. The strain grew at 10-37 °C (optimum, 25-30 °C), pH 6.0-10.0 (pH 7.0) and with 0.5-13.0 % (w/v) NaCl (2.5%). It reduced nitrate to nitrite, but did not produce bacteriochlorophyll . The results of phylogenetic analysis based on 16S rRNA gene sequences revealed that strain SM1902 constituted a separated lineage within the family and was closely related to TG-679 and LMIT002 with 96.1 and 94.3 % 16S rRNA gene sequence similarities, respectively. The predominant cellular fatty acid was summed feature 8 (Cω7 and/or Cω6). The major polar lipids were phosphatidylethanolamine, phosphatidylglycerol, phosphatidylcholine, an unidentified aminolipid and an unidentified lipid. The sole respiratory quinone was ubiquinone-10. The DNA-DNA hybridization values between strain SM1902 and TG-679 and LMIT002 were 19.6 and 19.5 %, respectively; and the average nucleotide identity values between them were 76.1 and 74.2 %, respectively. The genomic DNA G+C content of strain SM1902 was 58.2 mol%. Based on the phylogenetic, chemotaxonomic and phenotypic data obtained in this study, strain SM1902 is considered to represent a novel species in a new genus within the family , for which the name gen. nov., sp. nov. is proposed. The type strain is SM1902 (=KCTC 72045=MCCC 1K03596=CCTCC AB 2018346).