Strain JL2247(T), an aerobic, Gram-negative, gliding motile bacterium, was isolated from the western Pacific at the depth of 2,000 m. The cell was spindle-shaped with two narrow poles, and flagella were not observed. The colony was circular, translucent, and milky. This strain showed catalase-positive and oxidase-negative reactions. Its optimal growth conditions were at 32 A degrees C, pH 7.3, and 3 % NaCl. The predominant polar lipids were phosphatidylcholine, diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine, and phosphatidylmonomethylethanolamine. The major fatty acids were summed feature 8 (18:1 w7c and/or 18:1 w6c) and Cyclo C-19:0 omega 8c and the major respiratory quinone was Q-10. The DNA G+C content of strain JL2247(T) was 72.6 mol%. Phylogenetic analyses based on 16S rRNA gene sequences showed that strain JL2247(T) fell into the genus Seohaeicola, family Rhodobacteraceae, order Rhodobacterales, class Alphaproteobacteria, sharing the highest similarity with the only species Seohaeicola saemankumensis SD-15(T) (96.4 % similarity). From the phenotypic, genotypic, and chemotaxonomic data, strain JL2247(T) represents a novel species of the genus Seohaeicola and the name is proposed as Seohaeicola westpacificensis sp. nov. The type strain is JL2247(T) (=CGMCC 1.12198(T) = JCM18883).