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Abstract
A total of 113 violet chromogens, 45 of which produced spreading colonies characteristic of Chromobacterium fluviatile, were isolated from fresh water. These isolates and 27 other chromobacteria, 9 duplicates, and 11 reference strains were subjected to 95 characterization tests, and similarities were computed by using the coefficient of Gower. Cluster and principal coordinate analyses showed Janthinobacterium lividum to be a heterogeneous species but Chromobacterium violaceum and C. fluviatile to be well-separated and homogeneous phenons. The new, monospecific genus Iodobacter is proposed to accommodate C. fluviatile, which was originally placed in the genus Chromobacterium, despite its low guanine-plus-cytosine content (50 to 52 mol %, but 65 to 68 mol% for C. violaceum), pending the study of further isolates. The type strain of Iodobacter fluviatile comb. nov. is NCTC 11159.
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