Butyratibacter algicola gen. nov., sp. nov., a marine bacterium from the culture broth of Picochlorum sp. 122.

A Gram-stain-negative, motile, non-spore-forming, ovoid or rod-shaped bacterium, designated strain B15T, was isolated from the culture broth of a marine microalga, Picochlorum sp. 122. Phylogenetic analyses based on 16S rRNA gene sequences indicated that strain B15T forms a stable cluster with Lutibaculum baratangense KCTC 22669T (95.4 % 16S rRNA gene sequence similarity), Tepidamorphus gemmatus CB-27AT (94.9 %) and Microbaculum marinum HSF11T (94.6 %) in the family Rhodobiaceae. Optimal growth of strain B15T was observed at 33 °C, pH 8-9 and in the presence of 3 % (w/v) NaCl. The only detected ubiquinone of strain B15T was Q-10, and the G+C content of the genomic DNA was 66.3 mol%. The major fatty acid profile comprised C19 : 0 cyclo ω8c, C18 : 1ω7c/ω6c and C17 : 1 iso I/anteiso B. The major polar lipids of strain B15T were diphosphatidylglycerol, phosphatidylglycerol, phosphatidylcholine, phosphatidylethanolamine, phosphatidylmonomethylethanolamine, two unidentified aminolipids, and one unidentified lipid. Comprehensive analyses based on polyphasic characterization of strain B15T indicated that it represents a novel species of a new genusin the family Rhodobiaceae, for which the name Butyratibacter algicola gen. nov., sp. nov. is proposed. The type strain of the type species is B15T (=KCTC 52552T=MCCC 1K03221T).