A strictly aerobic, Gram-negative, apricot-pigmented, non-motile, rod-shaped strain designated KMU-14(T) was isolated from seawater collected from the coastal zone of Yokji Island, Gyeongsangnam-do, Republic of Korea. Phylogenetic analysis based on the 16S rRNA gene sequence revealed that the novel isolate was affiliated with the genus Lysobacter within the class Gatntnaproteobacteria and that it showed the highest sequence similarity (97.1 %) to Lysobacter concretionis Ko07(T). The hybridization value for DNA DNA relatedness between the strains of KMU-14(T) and L. concretionis Ko07(T) was 34.8 %, which was lower than 70 %, the recommended delineation value for differentiation of species. The DNA G+C content of strain KNIU-14(T) was 64.9 mol%. The major respiratory quinone was ubiquinone 8 (Q-8), and iso-C15:0, iso-C16:0, and 10 -methyl C16:0 and/or iso-C17:1 omega 9c were the major (>10 %) cellular fatty acids. A polar lipid profile was present consisting of diphosphatidylglycerol, phosphatidylethanolamine, an unidentified phosphoglycolipid, two unidentified aminophospholipids, and two unidentified phospholipids. From the distinct phylogenetic position and combination of genotypic and phenotypic characteristics, the strain is considered to represent a novel species for which the name Lysobacter maxis sp. nov. is proposed. The type strain of L. mans sp. nov. is KNIU-14(T) (=KCTC 42381(T) =NBRC 110750(T)).