A Gram-stain-negative, facultatively anaerobic, non-pigmented, non-sporulating, rod-shaped bacterial strain (WYH 22-41T) was isolated from a phosphate mine in Yunnan Province, China. The cells were motile with a single polar flagellum. The 16S rRNA gene of strain WYH 22-41T was phylogenetically related to the corresponding gene of Comamonas terrae DSM 27221T (98.4 % 16S rRNA gene sequence similarity), Comamonas odontotermitis LMG 23579T (97.6 %) and Comamonas aquatica LMG 2370T (97.4 %). DNA-DNA hybridizations of strain WYH 22-41T with these three strains showed relatedness values of 33.2 %, 20.5 % and 27.7 %, respectively. The DNA G+C content of strain WYH 22-41T was 62.4 mol%. The predominant respiratory quinone was ubiquinone-8. The major polar lipids were diphosphatidylglycerol, phosphatidylethanolamine and phosphatidylglycerol. The major fatty acids of strain WYH 22-41T were C16 : 0, C17 : 0 cyclo, summed feature 3 (C16 : 1ω6c and/or C16 : 1ω7c) and summed feature 8 (C18 : 1ω6c and/or C18 : 1ω7c). On the basis of phenotypic properties, phylogenetic characteristics, DNA-DNA hybridization, as well as whole-cell fatty acid composition, strain WYH 22-41T represents a novel species of the genus Comamonas, for which the name Comamonas phosphati sp. nov. is proposed. The type strain is WYH 22-41T ( = CGMCC 1.12294T = DSM 26017T).