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A novel Gram-negative, rod-shaped, motile bacterium, designated strain AK13T, was isolated from a sediment sample collected from mangrove of Namkhana, Sunderbans, West Bengal, India. Strain AK13T was positive for oxidase, DNase and lipase activities and negative for catalase, gelatinase, ornithine decarboxylase, lysine decarboxylase, nitrate reductase, aesculinase and urease activities. The fatty acids were dominated by iso-C11 : 0, iso-C11 : 0 3-OH, iso-C15 : 0, iso-C16 : 0, iso-C17 : 1ω9c and summed feature 3 (C16 : 1ω7c and/or iso-C15 : 0 2-OH). Strain AK13T contained Q-8 as the major respiratory quinone and diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylglycerol, phosphatidylserine, two unidentified aminolipids, one unidentified glycolipid and one unidentified lipid as the polar lipids. The DNA G+C content of strain AK13T was 55.2 mol%. Phylogenetic analysis based on 16S rRNA gene sequences indicated that the type strain of Silanimonas lenta , of the family Xanthomonadaceae (phylum Proteobacteria ), was the closest neighbour of strain AK13T, with 95.2 % sequence similarity. Other members of the family showed sequence similarities <94.4 %. Based on the phenotypic characteristics and phylogenetic inference, strain AK13T is proposed as a member of a novel species of the genus Silanimonas , Silanimonas mangrovi sp. nov.; the type strain is AK13T ( = MTCC 11082T = DSM 24914T). An emended description of the genus Silanimonas is also provided.