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Int J Syst Evol Microbiol. 2014 Jun;64(Pt 6):2079-83. doi: 10.1099/ijs.0.058255-0. Epub 2014 Mar 24.

Thalassomonas eurytherma sp. nov., a marine proteobacterium.

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College of Life Sciences, Zhejiang University, Hangzhou 310058, PR China.
Laboratory of Marine Ecosystem and Biogeochemistry, State Oceanic Administration, Hangzhou 310012, PR China Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, PR China.
College of Environmental & Resource Sciences, Zhejiang University, Hangzhou 310058, PR China.
Hangzhou Hunter Biotechnology, Hangzhou 311231, PR China.
Ocean Research Center of Zhoushan, Zhejiang University, Zhoushan 316021, PR China.
College of Life Sciences, Zhejiang University, Hangzhou 310058, PR China


Two Gram-staining-negative, aerobic, rod-shaped bacterial strains, designated Za6a-12(T) and Za6a-17, were isolated from seawater of the East China Sea. Cells of Za6a-12(T) and Za6a-17 were approximately 1.5-2.0 µm×0.5-0.7 µm and motile by a single polar flagellum. Strains grew optimally at pH 7.5-8.0, 28 °C, and in the presence of 2.5-3.0% (w/v) NaCl. Chemotaxonomic analysis showed that the predominant respiratory quinone of strains Za6a-12(T) and Za6a-17 was ubiquinone-8 (>97%), and the major fatty acids were C(14 : 0), C(16 : 1)ω7c and/or iso-C(15 : 0) 2-OH, C(16 : 0) and C(17 : 1)ω8c. Their DNA G+C contents were 42.7 mol% and 42.8 mol%, respectively. 16S rRNA gene sequence analysis revealed that the isolates belonged to the genus Thalassomonas and showed the highest sequence similarity to Thalassomonas loyana CBMAI 722(T) (95.9%). Strains Za6a-12(T) and Za6a-17 could be differentiated from T. loyana CBMAI 722(T) according to their phenotypic and chemotaxonomic features, DNA G+C contents and fatty acid composition. On the basis of these features, we propose strains Za6a-12(T) and Za6a-17 to be representatives of a novel species of the genus Thalassomonas with the name Thalassomonas eurytherma sp. nov. suggested. Strain Za6a-12(T) ( = CGMCC 1.12115(T) = JCM 18482(T)) is the type strain of this novel species.

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