Aquimarina celericrescens sp. nov., isolated from seawater

An orange-coloured, slender rod-shaped, gliding bacterium, designated NS08 T , was isolated from coastal water of Xiaoshi Island, Weihai, China (37° 31' 36'' N 122° 00' 58'' E). Cells were Gram-stain-negative, non-spore-forming, non-flagellated, aerobic, catalase-positive and oxidase-negative. Growth occurred at 10-37 °C (optimum 30 °C), in the presence of 1.0-5.0 % (w/v) NaCl (optimum 2.0-3.0 %) and at pH 6.5-9.0 (optimum pH 7.0-7.5). Carotenoid pigments were produced but flexirubin-type pigments were not. The major fatty acids (>10 %) were iso-C15 : 0 and iso-C17 : 0 3-OH. The sole isoprenoid quinone of strain NS08 T was menaquinone MK-6 and the DNA G+C content was 39.4 mol%. The polar lipid compositions of strain NS08 T and the type strain of the type species of the genus Aquimarina, Aquimarina muelleri KCTC 12285 T , were very similar with phosphatidylethanolamine, an unidentified aminolipid and two unknown polar lipids as the major components. A phylogenetic tree based on 16S rRNA gene sequences showed that strain NS08 T formed an evolutionary lineage within the genus Aquimarina and shared the highest level of similarity to A. versatilis JCM 19528 T (96.0 %) while level to A. muelleri KCTC 12285 T was 95.0 %. Phenotypic characteristics distinguished strain NS08 T from described members of the genus Aquimarina. On the basis of the evidence presented in this study, strain NS08 T represents a novel species of the genus Aquimarina, for which the name Aquimarina celericrescens sp. nov. is proposed. The type strain is NS08 T (=KCTC 52897 T =MCCC 1H00191 T ).