Pseudidiomarina donghaiensis sp. nov. and Pseudidiomarina maritima sp. nov., isolated from the East China Sea

Two Gram-negative, aerobic, motile, rod-shaped bacteria, designated strains 908033^T and 908087^T, were isolated from a seawater sample collected from the East China Sea. Chemotaxonomic characteristics of the two isolates included the presence of iso-C_15:0, iso-C_17:0 and iso-C_17:1ω9c as the major cellular fatty acids and Q-8 as the predominant ubiquinone. The genomic DNA G+C contents of strains 908033^T and 908087^T were 45.5 and 45.2 mol%, respectively. Phylogenetic analyses based on 16S rRNA gene sequences revealed that the new isolates were related to members of the genus Pseudidiomarina, showing levels of similarity of 95.8-96.6% with the type strains of recognized species of the genus. The results of DNA-DNA hybridization experiments among these two isolates and Pseudidiomarina sediminum CICC 10319^T, in combination with chemotaxonomic and phenotypic data, demonstrated that the new isolates represent two novel species of the genus Pseudidiomarina, for which the names Pseudidiomarina donghaiensis sp. nov. (type strain 908033^T=CGMCC 1.7284^T=JCM 15533^T) and Pseudidiomarina maritima sp. nov. (type strain 908087^T=CGMCC 1.7285^T=JCM 15534^T) are proposed.