Maribacter algicola sp. nov., isolated from a marine red alga, Porphyridium marinum, and transfer of Maripseudobacter aurantiacus Chen et al. 2017 to the genus Maribacter as Maribacter aurantiacus comb. nov.

A Gram-stain-negative, strictly aerobic and moderately halophilic bacterial strain, designated strain PoM-212 T , was isolated from a marine alga, Porphyridium marinum , in the Republic of Korea. Cells were catalase- and oxidase-positive rods with gliding motility without flagellum. Growth was observed at 20–40 °C (optimum, 30 °C) and pH 5.0–8.5 (pH 5.0–5.5) and in the presence of 0.5–5 % (w/v) NaCl (2–3 %). Strain PoM-212 T contained iso-C 15 : 1 , iso-C 15 : 0 , iso-C 17 : 0 3-OH and summed feature 3 (comprising C 16 : 1 ω7 c and/or C 16 : 1 ω6 c ) as major fatty acids and menaquinone-6 as the sole isoprenoid quinone. Phosphatidylethanolamine, three unidentified aminolipids and two unidentified polar lipids were detected as major polar lipids. The G+C content of the genomic DNA was 41.0 mol%. Strain PoM-212 T was most closely related to Maribacter lutimaris KJ4 T , Maripseudobacter aurantiacus CDA4 T and Maribacter flavus C3 T with 97.2, 97.2 and 97.0 % 16S rRNA gene sequence similarities, respectively, and it formed a distinct phylogenetic lineage from them within the genus Maribacter . Maripseudobacter aurantiacus formed a close phylogenetic lineage with Maribacter flavus with 99.7 % 16S rRNA gene sequence similarity, but their digital DNA–DNA hybridization value was 67.4 %. On the basis of its phenotypic, chemotaxonomic and molecular properties, strain PoM-212 T represents a novel species of the genus Maribacter , for which the name Maribacter algicola sp. nov. is proposed. The type strain is PoM-212 T (=KACC 19789 T =JCM 32941 T ). The transfer of Maripseudobacter aurantiacus to the genus Maribacter as Maribacter aurantiacus comb. nov. is also proposed (type strain CDA4 T =KCTC 52409 T =MCCC 1K03210 T ).