A strictly aerobic, Gram-negative, rod-shaped bacterium (strain CC-SAMT-1T) showing gliding motility was isolated from coastal seawater of China Sea, Taiwan. Strain CC-SAMT-1T synthesizes all-trans-zeaxanthin (6.5 ± 0.5 mg g−1 dry biomass) as a predominant xanthophyll carotenoid. As determined by 16S rRNA gene analysis, strain CC-SAMT-1T shared very high sequence similarity to the members of the genera Mariniflexile (96.1–95.3%) and Gaetbulibacter (96.0–95.9%); however, it formed a distinct phyletic lineage distantly associated with Mariniflexile species. Polar lipid profile constitutes phosphatidylethanolamine, four unidentified aminolipids, four unidentified lipids, and an unidentified glycolipid. Strain CC-SAMT-1T contains excessive unidentified aminolipid lipid (AL2–4) and glycolipid contents, and therefore clearly distinct from Mariniflexile species. Major fatty acids (> 5% of total fatty acids) were iso-C15:0 (14.8%), iso-C17:0 3-OH (11.8%), iso-C15:1 G (10.6%), anteiso-C15:0 (9.7%), C16:0 (8.1%), iso-C16:0 3-OH (7.9%), iso-C15:0 3-OH (7.5%), and summed feature 3 (containing C16:1 ω6c and/or C16:1 ω7c) (7.5%). Menaquinone-6 (MK-6) was major respiratory quinone. DNA G+C content was 33.7 mol%. Based on polyphasic taxonomy, strain CC-SAMT-1T represents a novel genus and species in the family Flavobacteriaceae for which the name Siansivirga zeaxanthinifaciens gen. nov., sp. nov. is proposed. The type strain is CC-SAMT-1T (= BCRC 80315T = JCM 17682T)
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