A Gram-negative, short rod- to coccus-shaped, non-spore-forming bacterium (Ch05T) was isolated from granules in an upflow anaerobic sludge blanket (UASB) reactor. On the basis of 16S rRNA gene sequence similarity, strain Ch05T was shown to belong to the subclass α-Proteobacteria, being related to Paracoccus solventivorans (97·5 %), Paracoccus alkenifer (96·9 %) and Paracoccus kocurii (96·4 %). The phylogenetic distance from Paracoccus species with validly published names was always less than 96 %. Physiological and chemotaxonomic data (major ubiquinone, Q-10; major fatty acids, C18 : 1 and C18 : 0) supported the affiliation of strain Ch05T to the genus Paracoccus. The results of DNA–DNA hybridization and physiological and biochemical tests allowed genotypic and phenotypic differentiation of strain Ch05T from the 17 Paracoccus species with validly published names. Ch05T therefore represents a novel species, for which the name Paracoccus koreensis sp. nov. is proposed. The type strain is Ch05T (=KCTC 12238T=IAM 15216T).
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