sp. nov., isolated from a marine red alga, reclassification of and as comb. nov. and comb. nov., and emended description of the genus Joshi . 2022.

A Gram-stain-positive alkali-tolerant and strictly aerobic bacterium, designated strain P16, was isolated from a marine red alga, , in the Yellow Sea, Republic of Korea. Cells were motile rods with peritrichous flagella and exhibited catalase and oxidase activities. The optimal growth of strain P16 was observed to occur at 30 °C and pH 8.0 and in the presence of 2.0 % (w/v) NaCl. Menaquinone-7 was identified as the sole respiratory quinone. Strain P16 contained anteiso-C, iso-C, iso-C and iso-C, and diphosphatidylglycerol, phosphatidylglycerol and phosphatidylethanolamine as major cellular fatty acids and polar lipids, respectively. The G+C content of strain P16 was 40.8 mol%. Strain P16 was most closely related to P203, DSM 8722 and LMG 21005 with 98.1, 98.1 and 98.0 % 16S rRNA gene sequence similarities, respectively. Phylogenetic analyses based on 16S rRNA gene and genome sequences revealed that strain P16, , and formed a single phylogenetic lineage cluster, and genomic relatedness analyses showed that they are different species. Based on phylogenetic, phenotypic, chemotaxonomic and molecular features, strain P16 represents a novel species of the genus , for which the name sp. nov. is proposed. The type strain is P16 (=KACC 19520=JCM 32931). In addition, and are reclassified as comb. nov. (type strain P203=DSM 19153=NCIMB 14288) and comb. nov. (type strain PN-109=ATCC 700164=DSM 8722=KCCM 41407), respectively.