A non-motile, coccobacillus-shaped and pink pigmented bacterium, designated strain 03SU10-P(T), was isolated from wetland freshwater (Woopo wetland, Republic of Korea). Cells were Gram reaction-negative and catalase- and oxidase-positive. The major fatty acids (>10% of total) were C(18:1)ω7c and summed feature 3 (iso-C(15:0) 2-OH and/or C(16:1)ω7c). The predominant respiratory lipoquinone was Q-10. The DNA G+C content was 68 mol%. The major polar lipids were phosphatidylethanolamine, phosphatidylcholine and an unknown aminolipid. Spermidine, putrescine and 1,3-diaminopropane were the major polyamines. A phylogenetic tree based on 16S rRNA gene sequence comparisons showed that strain 03SU10-P(T) formed an evolutionary lineage within the radiation enclosing the members of the genus Roseomonas. The nearest neighbour to the novel strain was Roseomonas stagni HS-69(T) (96.3% gene sequence similarity). The evidence provided by the polyphasic taxonomic approach used in this study indicated that strain 03SU10-P(T) could not be assigned to any recognized species; therefore a novel species is proposed, Roseomonas riguiloci sp. nov., with 03SU10-P(T) ( = KCTC 23339(T) = JCM 17520(T)) as the type strain.