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A novel actinobacterium, designated strain SYSU M44304^T, was isolated from freshwater samples in the Pearl River Estuary. The isolate was Gram-stain-positive, aerobic, coccus-shaped, oxidase-positive and motile. The cell wall contained meso-diaminopimelic acid as its diagnostic diamino acid. The predominant menaquinone was MK-8. The major polar lipids were diphosphatidylglycerol, phosphatidylglycerol, phosphatidylinositol, phosphatidylethanolamine and seven unidentified phospholipids. The major fatty acids were C_16 : 0 and C_16 : 1. The G+C content based on genomic DNA was 73.2 mol %. The nearest phylogenetic neighbours to the novel strain were Mobilicoccus pelagius NBRC 104925^T and Mobilicoccus caccae YIM 101593^T. On the basis of chemotaxonomic and physiological characteristics and phylogenetic analysis, strain SYSU M44304^T should be considered to represent a novel …