Pseudoruegeria lutimaris sp. nov., isolated from a tidal flat sediment, and emended description of the genus Pseudoruegeria.

A Gram-negative-staining, non-motile and rod-shaped bacterial strain, HD-43(T), was isolated from a tidal flat sediment collected from Hwang-do, an island of Korea. Strain HD-43(T) grew optimally at pH 7.0-8.0, at 30 degrees C and in the presence of 2 % (w/v) NaCl. Phylogenetic analyses based on 16S rRNA gene sequences showed that strain HD-43(T) clustered with Pseudoruegeria aquimaris SW-255(T). It exhibited 96.6 % 16S rRNA gene sequence similarity and 79.4 % gyrB sequence similarity with P. aquimaris SW-255(T). Strain HD-43(T) contained Q-10 as the predominant ubiquinone and C(18 : 1)omega7c as the major fatty acid. The major polar lipids were phosphatidylcholine, phosphatidylglycerol, phosphatidylethanolamine, an unidentified aminolipid, an unidentified glycolipid and an unidentified lipid. The DNA G+C content was 73.5 mol%. The mean DNA-DNA relatedness between strain HD-43(T) and P. aquimaris SW-255(T) was 5 %. Differential phenotypic properties demonstrated that strain HD-43(T) is clearly distinguishable from P. aquimaris. On the basis of phenotypic, chemotaxonomic and phylogenetic data, strain HD-43(T) is considered to represent a novel species of the genus Pseudoruegeria, for which the name Pseudoruegeria lutimaris sp. nov. is proposed. The type strain is HD-43(T) (=KCTC 22690(T) =CCUG 57754(T)).