Serratia is a ubiquitous genus in nature which belongs to the family Enterobacteriaceae.Serratia species have been isolated from various environments,such as soil, water, plants surfaces and animals.In this study, A Gram-negative,rod-shaped, salt-insensitive, non-pigment and non-spore-forming bacterium,designated strain W1T (CICC 23797, CGMCC1.14949), was isolated from sewage samples of the dairy farm in Bozhou, Anhui, China.Sequence analysis of the 16S rRNA gene revealed that the strain showed sequence similarity of 98.2% with the closest related species Serratia quinivorans CP6a T.The genomic DNA G+C content of the isolate was 52.8 mol%.The biochemical characteristics of strain W1T confirmed by the API 20NE and Biolog GEN Ⅲ analysis were similar to those of the members of the genus Serratia.These data, together with phenotypic characterization,revealed that strain W1 is classified in a novel Serratia species, Serratia sp.nov W1 T.