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Department of Microbiology, Oregon State University, Corvallis, OR 97331, USA
Correspondence
Stephen J. Giovannoni
steve.giovannoni{at}oregonstate.edu
Two Gram-negative, chemoheterotrophic, non-motile, rust-coloured, marine strains were isolated from the western Sargasso Sea by high-throughput culturing. Characterization of the two strains by polyphasic approaches indicated that they are members of the same species. Phylogenetic analyses based on 16S rRNA gene sequences using three treeing algorithms revealed that the strains formed a coherent and novel genus-level lineage within the family Flavobacteriaceae. The dominant fatty acids were branched or hydroxy acids, i15 : 0, i15 : 1 and 3-OH i17 : 0 being the most abundant. The higher DNA G+C content of the strains (5556 mol%) clearly differentiated them from other genera of the family Flavobacteriaceae (2744 mol%). It is proposed, from the polyphasic evidence, that the strains be placed into a novel genus and a novel species named Robiginitalea biformata gen. nov., sp. nov., with strain HTCC2501T (=ATCC BAA-864T=KCTC 12146T) as the type strain.
The GenBank accession numbers for the 16S rRNA gene sequences of strains HTCC2501T and HTCC2514 are AY424899 and AY424900.
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