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Shewanella marisflavi sp. nov. and Shewanella aquimarina sp. nov., slightly halophilic organisms isolated from sea water of the Yellow Sea in Korea

¹ Korea Research Institute of Bioscience and Biotechnology (KRIBB), PO Box 115, Yusong, Taejon, Korea
² The Center for Traditional Microorganism Resources, Keimyung University, Shindang-Dong, Dalseo-gu, Daegu, Korea

Correspondence
Jung-Hoon Yoon
jhyoon{at}kribb.re.kr

Two Gram-negative, motile, non-spore-forming, rod-shaped organisms, strains SW-117^T and SW-120^T, were isolated from sea water of the Yellow Sea in Korea and subjected to a polyphasic taxonomic study. Strains SW-117^T and SW-120^T simultaneously contained both menaquinones (MK) and ubiquinones (Q) as isoprenoid quinones; the predominant menaquinone was MK-7 and the predominant ubiquinones were Q-7 and Q-8. The major fatty acid detected in the two strains was iso-C_{15 : 0}. The DNA G+C content of strains SW-117^T and SW-120^T was 51 and 54 mol%, respectively. Phylogenetic analyses based on 16S rRNA gene sequences showed that strains SW-117^T and SW-120^T fall within the radiation of the cluster comprising Shewanella species. Strains SW-117^T and SW-120^T showed a 16S rRNA gene sequence similarity of 97·4 % and a DNA–DNA relatedness level of 10·1 %. Strains SW-117^T and SW-120^T exhibited 16S rRNA gene sequence similarity levels of 93·8–98·5 % and 92·4–97·0 %, respectively, to Shewanella species. Strain SW-117^T exhibited DNA–DNA relatedness levels of 8·3–20·3 % to the type strains of six phylogenetically related Shewanella species. On the basis of phenotypic, phylogenetic and genetic data, strains SW-117^T and SW-120^T were classified in the genus Shewanella as two distinct novel species, for which the names Shewanella marisflavi sp. nov. (type strain, SW-117^T=KCCM 41822^T=JCM 12192^T) and Shewanella aquimarina sp. nov. (type strain, SW-120^T=KCCM 41821^T=JCM 12193^T) are proposed, respectively.

The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA gene sequences of strains SW-117^T and SW-120^T and Shewanella colwelliana ATCC 39565^T are AY485224, AY485225 and AY653177, respectively.

Detailed phenotypic characteristics of Shewanella marisflavi, Shewanella aquimarina and related species, and an expanded neighbour-joining tree are available as supplementary material in IJSEM Online.

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