Lutibacter crassostreae sp. nov., isolated from oyster.

A Gram-stain-negative, aerobic, non-spore-forming, non-flagellated, non-gliding and ovoid or rod-shaped bacterial strain, designated TYO-8T, was isolated from an oyster collected from the South Sea in South Korea. Strain TYO-8T grew optimally at 25 °C, at pH 7.0-8.0 and in the presence of 2.0-3.0% (w/v) NaCl. A neighbour-joining phylogenetic tree, based on 16S rRNA gene sequences, revealed that strain TYO-8T fell within the clade comprising the type strains of species of the genus Lutibacter, clustering coherently with the type strain of Lutibacter litoralis with a sequence similarity of 99.3%. Strain TYO-8T exhibited 16S rRNA gene sequence similarity values of 95.3-97.5% to the type strains of other species of the genus Lutibacter and of less than 92.9% to the type strains of other species with validly published names. Strain TYO-8T contained MK-6 as the predominant menaquinone and iso-C15 : 0, iso-C15 : 0 3-OH and iso-C15 : 1 G as the major fatty acids. The major polar lipids of strain TYO-8T were phosphatidylethanolamine and two unidentified lipids. The DNA G+C content of strain TYO-8T was 33.8 mol% and its DNA-DNA relatedness values with the type strains of L. litoralis, Lutibacter aestuarii and Lutibacter flavus were 13-27%. The differential phenotypic properties, together with the phylogenetic and genetic distinctiveness, revealed that strain TYO-8T is distinct from other species of the genus Lutibacter. On the basis of the data presented, strain TYO-8T is considered to represent a novel species of the genus Lutibacter, for which the name Lutibacter crassostreae sp. nov. is proposed. The type strain is TYO-8T ( = KCTC 42461T = NBRC 110923T).