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Costertonia aggregata gen. nov., sp. nov., a mesophilic marine bacterium of the family Flavobacteriaceae, isolated from a mature biofilm

¹ Marine Biotechnology Research Center, Korea Ocean Research and Development Institute, Ansan PO Box 29, 425-600, Republic of Korea
² Polar BioCenter, Korea Polar Research Institute, Korea Ocean Research and Development Institute, Ansan PO Box 29, 425-600, Republic of Korea

Correspondence
Hong Kum Lee
hklee{at}kopri.re.kr

A marine bacterium, strain KOPRI 13342^T, was isolated from a mature marine biofilm, including various marine algae, covering a rock-bed of the East Sea, Korea (also known as the Sea of Japan). Colonies of the isolate were orange-coloured on marine agar 2216. The isolate showed relatively high 16S rRNA gene sequence similarities to members of the genera Maribacter (91.2–92.4 % similarity), Zobellia (90.7–91.5 %) and Muricauda (90.7–91.4 %). Phylogenetic analysis based on the nearly complete 16S rRNA gene sequence revealed that the isolate formed a phyletic lineage with members of the genus Muricauda. Cells were aerobic, motile, Gram-negative rods and they produced non-diffusible carotenoid pigments. Optimal growth was observed at pH 7.5–8.0 and 26–32 °C and required the presence of 3 % (w/v) sea salt. The strain required Ca²⁺ and K⁺ ions in addition to NaCl for growth. The dominant fatty acids were i-15 : 0, i-15 : 110, 15 : 0 and 16 : 19. The major respiratory quinone was MK-6. The DNA G+C content was 35.8 mol%. On the basis of this polyphasic taxonomic evidence, strain KOPRI 13342^T should be classified as a representative of a novel species in a new genus in the family Flavobacteriaceae; the name Costertonia aggregata gen. nov., sp. nov. is proposed. The type strain of Costertonia aggregata is KOPRI 13342^T (=KCCM 42265^T=JCM 13411^T).

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