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A Gram-stain-negative, non-motile bacterial strain designated 1NM-4T was isolated from an abandoned lead–zinc ore mine site in Mei County, Meizhou, Guangdong Province, southern China. The isolate was light yellow, strictly aerobic, oxidase-negative and catalase-positive. Phylogenetic analyses based on 16S rRNA, rpoB and gyrB gene sequences, together with DNA–DNA hybridization values less than 70 %, revealed that strain 1NM-4T belongs to the genus Acinetobacter and may represent a novel species. The major respiratory quinone was ubiquinone 9 (Q-9) and the major cellular fatty acids consisted of C18 : 1ω9c, summed feature 3 (C16 : 1ω7c and/or C16 : 1ω6c), C16 : 0 and C12 : 0. The major polar lipids were diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylglycerol, phosphatidylcholine, an unidentified aminolipid and two unidentified phospholipids. The genomic DNA G+C content of strain 1NM-4T was 47.17±0.02 mol%. Based on phenotypic, phylogenetic and chemotaxonomic characteristics, strain 1NM-4T should be assigned to a novel species of the genus Acinetobacter , for which the name Acinetobacter guangdongensis sp. nov. is proposed. The type strain is 1NM-4T ( = GIMCC 1.656T = CCTCC AB 2014199T = KCTC 42012T).
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