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A total of 14 Halomonas strains were isolated from the blood of two patients and from dialysis machines of a renal care centre. The strains were Gram-negative, halophilic, motile and non-spore-forming rods. They produced cream-coloured colonies and contained Q-9 as the predominant ubiquinone and C18 : 1 ω7c and C16 : 0 as the major fatty acids. Phylogenetic analysis based on 16S rRNA gene sequencing showed that the 14 isolates were most closely related to Halomonas magadiensis 21 MIT with 98.1–98.9 % sequence similarity and that they formed three separate lineages among themselves. Combined phenotypic and DNA–DNA hybridization data support the conclusion that they represent three novel species of the genus Halomonas, for which the names Halomonas stevensii sp. nov. (type strain S18214T=KCTC 22148T=DSM 21198T), Halomonas hamiltonii sp. nov. (type strain W1025T=KCTC 22154T=DSM 21196T) and Halomonas johnsoniae sp. nov. (type strain T68687T=KCTC 22157T=DSM 21197T) are proposed.
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