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A motile and rod-shaped bacterium, designated strain KYW1030(T), was isolated from seawater collected from the Gwangyang bay (Republic of Korea). Cells were Gram-reaction-negative, aerobic, catalase-positive and oxidase-negative. The major fatty acids were summed feature 4 (iso-C-17 : 1 I and/or anteiso-C-17 : 1 B), iso-C-15 : 0 and iso-C-17 : 0 3-OH. The strain contained MK-7 as the major isoprenoid quinone, phosphatidylethanolamine and diphosphatidylglycerol as the major polar lipids and sym-homospermidine as the major polyamine. The DNA G+C content was 46 mol%. A phylogenetic tree based on 16S rRNA gene sequences showed that strain KYW1030(T) forms an evolutionary lineage within the radiation enclosing the members of the genus Pontibacter, with Pontibacter akesuensis AKS 1(T) (97.9% 16S rRNA gene sequence similarity) as its nearest neighbour. A number of phenotypic characteristics distinguished strain KYW1030(T) from the related members of the genus Pontibacter. On the basis of the evidence presented in this study, a novel species, Pontibacter rugosus sp. nov., is proposed for strain KYW1030(T) (= KACC 18739(T) = JCM 31319(T)).