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Marinoscillum gen. nov., a member of the family ‘Flexibacteraceae’, with Marinoscillum pacificum sp. nov. from a marine sponge and Marinoscillum furvescens nom. rev., comb. nov.

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

Correspondence
Kae Kyoung Kwon
kkkwon{at}kordi.re.kr

A novel strain, designated MRN461^T, was isolated from a marine sponge in Micronesia. The 16S rRNA gene sequence of the isolate showed 95.6 % similarity with that of ‘Microscilla furvescens’ IFO (now NBRC) 15994. Phylogenetic analysis revealed that the isolate and ‘Microscilla furvescens’ IFO 15994 formed a distinct phyletic line within the family ‘Flexibacteraceae’. Cells of strain MRN461^T were Gram-negative, long filamentous rods, motile by gliding. Growth was observed at 15–40 °C (optimum, 33 °C), at pH 5.0–9.5 (optimum, pH 7.5) and in the presence of 0.5–7.0 % sea salts (optimum, 2.5 %). The major isoprenoid quinone was MK-7. The dominant fatty acids were summed feature 3 (comprising iso-C_{15 : 0} 2-OH and/or C_{16 : 1}7c; 34.8 %), C_{16 : 1}5c (21.6 %) and iso-C_{16 : 1} (19.8 %). The DNA G+C content was 41.5 mol%. On the basis of evidence from our polyphasic taxonomic study, strain MRN461^T is classified within a novel genus and species in the family ‘Flexibacteraceae’, for which the name Marinoscillum pacificum gen. nov., sp. nov. is proposed. The type strain of Marinoscillum pacificum is strain MRN461^T (=KCCM 42325^T =JCM 14064^T). The misclassified species ‘[Microscilla] furvescens’ is transferred to the new genus as Marinoscillum furvescens (ex Lewin 1969) nom. rev., comb. nov., with LMG 13023^T (=DSM 4134^T =ATCC 23129^T =NBRC 15994^T) as the type strain.

A table listing differentiating characteristics of the two Marinoscillum species is available as supplementary material with the online version of this paper.