A novel bacterial strain, designated HX-9-20(T), was isolated from the sediment collected from the wastewater outlet of an agricultural chemical plant in Maanshan city, Anhui province, PR China. Cells of strain HX-9-20(T)were Gram-staining-negative, rod-shaped, translucent, non-motile, and strictly aerobic. Growth was observed between 15 and 35 degrees C (optimum 30 degrees C), at pH 6.0-8.0 (optimum pH 7.0), and in the presence of 0-0.4% (w/v) NaCl (optimum 0.2%). The predominant cellular fatty acids were summed feature 3 (C-16:1 omega 7c and/or C-16:1 omega 6c), C(16:0)and summed feature 8 (C-18:1 omega 6c and/or C-18:1 omega 7c). The major quinone was ubiquinone Q-8. The major polar lipids were phosphatidylglycerol, phosphatidylethanolamine, and an aminophospholipid. Strain HX-9-20(T)contains 2-hydroxyputrescine and putrescine as the major polyamine. A phylogenetic analysis based on 16S rRNA gene sequences revealed that strain HX-9-20(T)was affiliated with the genusCaenimonas, exhibiting the highest sequence similarities withCaenimonas koreensisEMB320(T)(97.3% similarity) andRamlibacter humi18x22-1(T)(97.0%), and less than 97.0% similarity with other type strains. The average nucleotide identity (ANI) and digital DNA-DNA hybridization values (dDDH) between HX-9-20(T)andC. koreensisEMB320(T)were 76.9% and 23.5% respectively. The ANI and dDDH between HX-9-20(T)andR. humi18x22-1(T)were 80.3% and 23.6%, respectively. The G + C content of the genomic DNA was 67.5 mol%. On the basis of the polyphasic taxonomic data, strain HX-9-20(T)represents a novel species of the genusCaenimonas, for which the nameCaenimonas sedimentisp. nov. is proposed. The type strain is HX-9-20(T)(=KCTC 72473(T)=CCTCC AB 2019266(T)).