Three rod-shaped, Gram-negative, chemo-organotrophic, heterotrophic, strictly aerobic, gliding bacterial strains, KT02ds18-4, KT02ds18-5 and KT02ds18-6, were isolated from North Sea surface waters near the island of Helgoland, Germany. Their taxonomic position was investigated by a polyphasic approach. The three strains were light yellow, oxidase- and catalase-positive, and grew optimally at 25 °C, at pH 7.5, and in the presence of 2.5 % (w/v) NaCl. The Chargaff's coefficient was 34.2–34.4 mol%. The three strains shared >90 % DNA–DNA relatedness and an identical 16S rRNA gene sequence. Comparative 16S rRNA gene sequence analysis allocated the three strains to the genus in the family , with similarities of 97.0–97.4 % to five of the recognized species. Their low level of DNA–DNA relatedness (<20 %) with these species and differentiating phenotypic characteristics demonstrated that they constitute a new species for which the name sp. nov. is proposed. Strain KT02ds18-6 (=CIP 109504=DSM 18668) is the type strain. An emended description of the genus is also proposed.


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vol. , part 4, pp. 790-797

Electron micrographs of strain KT02ds18-6 stained with uranyl acetate (a) or phosphotungstic acid (b). Bars, (a) 0.8 μm; (b) 0.6 μm.

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