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Marinobacter adhaerens sp. nov., prominent in aggregate formation with the diatom Thalassiosira weissflogii Eva C. Kaeppel 1 , Astrid Gärdes 1 , Shalin Seebah 1 , Hans-Peter Grossart 2 , Matthias S. Ullrich 1 1 <strong>Jacobs</strong> <strong>University</strong> Bremen, Campus Ring 1, 28759 Bremen, Germany 2 Leibniz Institute of Freshwater Ecology and Inland Fisheries - Neuglobsow, Alte Fischerhütte 2, 16775 Stechlin, Germany Correspondence: Matthias S. Ullrich m.ullrich@jacobs-university.de ______________________________________________________________________ The Gram-negative, motile, and rod-shaped bacterial strain, HP15 T , was isolated from particles sampled in surface waters of the German Wadden Sea. It was identified among 82 other marine isolates due to its high potential to induce production of transparent exopolymeric particles and aggregate formation while interacting with the diatom, Thalassiosira weissflogii. HP15 T grew optimally at a range of 34-38 °C, a pH of 7-8.5, and was able to tolerate salt concentrations between 0.5-20 % (w/v) NaCl. HP15 T was chemotaxonomically characterized by possessing ubiquinone-9 as the major respiratory lipoquinone as well as C 16:0 , C 18:1 !9c, C 16:1 !7c/iso, and C 15:0 2-OH as predominant fatty acids. The G+C content of its DNA was 56.9 mol%. The closest relative by means of 16S rRNA sequence analysis was Marinobacter flavimaris with a similarity level of 99 %. The whole-genome relatedness of HP15 T to M. flavimaris, M. salsuginis, M. lipolyticus, and M. algicola was determined to be lower than 70 % by DNA-DNA hybridization. On the basis of phenotypic and chemotaxonomic properties as well as phylogenetic analyses, strain HP15 T (=DSM 23420 T = CIP 110141 T ) is proposed to represent the novel species, Marinobacter adhaerens sp. nov. ______________________________________________________________________ The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain HP15 T is AY241552. A transmission electron micrograph of HP15 T and the comparison of cellular fatty acid composition between strain HP15 T and type strains of seven other Marinobacter species are available as supplementary material in IJSEM Online. !"#$%&'(#!%") !"#$ %#&'($ !"#$%&'"()*#$ )*($ #(+*,-.("#/$ ).+"$ +"#$ (0#1.#($ !"#$%&'"()*#+ ,-.#&("#/ '&%&(0"1)$(21$ .&$ 2334$ 56*'+".#7+ *)+ "038$ 23349:$ ;$ +
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