Abstract
A Gram-stain-negative strain, designated FM6T, was isolated from surface seawater sampled at the port in Xiamen, PR China. Strain FM6T showed less than 96.3 % 16S rRNA gene sequence similarity to the type strains of species with validly published names. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain FM6T belonged to the family Sphingomonadaceae and was closely related to species of the genera Sphingomonas (96.3 %) and Stakelama (96.0 %). Ubiquinone-10 was the predominant respiratory quinone. Cells were motile with a single polar flagellum. Growth occurred at temperatures from 20 to 45 °C (optimum, 30 °C), at pH values between pH 6.0 and 8.0 (optimum, pH 7.0) and in 0-4.0 % (w/v) NaCl (optimum, 1.0-1.5 %). Predominant polar lipids were sphingoglycolipid, phosphatidylcholine, diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylglycerol, five unidentified glycolipids and five unidentified polar lipids. The major fatty acids were summed feature 8 (containing C18 : 1ω7c and/or C18 : 1ω6c). The DNA G+C content of the type strain was 63.8 mol%. On the basis of the results of phylogenetic analysis, combined with phenotypic and chemotaxonomic data, strain FM6T is considered to represent a novel species in a new genus in the family Sphingomonadaceae for which the name Sphingosinithalassobacter portus gen. nov., sp. nov. is proposed. The type strain of Sphingosinithalassobacter portus gen. nov., sp. nov. is FM6T (=MCCC 1K03501T=JCM 32714T).
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