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Ruegeria pelagia sp. nov., isolated from the Sargasso Sea, Atlantic Ocean

¹ Division of Biology and Ocean Sciences, Inha University, Incheon 402-751, Republic of Korea
² Department of Microbiology, Oregon State University, Corvallis, OR 97331, USA

Correspondence
Jang-Cheon Cho
chojc{at}inha.ac.kr

Gram-negative, facultatively aerobic, chemoheterotrophic, short rod-shaped marine bacterial strains HTCC2662^T and HTCC2663, isolated from the Sargasso Sea by using a dilution-to-extinction culturing method, were investigated to determine their taxonomic position. Characterization of the two strains by phenotypic and phylogenetic analyses revealed that they belonged to the same species. The DNA G+C content of strain HTCC2662^T was 58.4 mol% and the predominant cellular fatty acids were C_{18 : 1}7c (52.5 %), C_{16 : 0} 2-OH (13.5 %) and C_{18 : 1} 11-methyl 7c (12.2 %). Phylogenetic analysis of the 16S rRNA gene sequences showed that the strains represented a distinct line of descent within the genus Ruegeria, with highest sequence similarities to Ruegeria atlantica DSM 5823^T (97.2 %), Ruegeria lacuscaerulensis DSM 11314^T (96.5 %) and Ruegeria pomeroyi DSM 15171^T (95.6 %). Several phenotypic characteristics, including facultatively requiring NaCl and oxygen for growth, together with the cellular fatty acid composition, differentiated strain HTCC2662^T from other members of the genus Ruegeria. Based on phenotypic, chemotaxonomic and phylogenetic traits, it is suggested that strains HTCC2662^T and HTCC2663 represent a novel species of the genus Ruegeria, for which the name Ruegeria pelagia sp. nov. is proposed. The type strain is HTCC2662^T (=KCCM 42378^T=NBRC 102038^T).

A transmission electron micrograph of cells of strain HTCC2662^T is available with the online version of this paper.

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