Taxonomic Comments

The two species presently comprising the genus Halochromatium were originally described as species of the genus Chromatium, because they have rod-shaped, motile cells without gas vesicles, features that previously defined the species of the genus Chro-matium (Pfennig and Trtiper, 1974, 1989). As a consequence of 16S rDNA sequence analyses, which showed their phylogenetic distance from true Chromatium species and other members of the family Chromatiaceae, they were transferred to the new genus Ha-lochromatium (Imhoff et al., 1998b). Halochromatium species are among the most halophilic species of the family Chromatiaceae and belong to the branch of truly marine and halophilic Chro-matiaceae species.

Further Reading

Caumette, P. , Baulaigue, R. and Matheron, R. 1988. Characterization of Chromatium salexignes sp. nov., a halophilic Chromatiaceae isolated from Mediterranean salinas. System. Appl. Microbiol. 10: 284-292.

Caumette, P., Imhoff, J.F., Süling, J. and Matheron, R. 1997. Chromatium glycolicum sp. nov., a moderatly halophilic purple sulfter bacterium that uses glycolate as a substrate. Arch. Microbiol. 167: 1129-1143.

Imhoff, J.F., Süling, J. and Petri, R. 1998. Phylogenetic relationships among the Chromatiaceae, their taxonomic reclassification and description of the new genera Allochromatium, Halochromatium, Isochro-matium, Marichromatium, Thiococcus, Thiohalocapsa, and Thermochro-matium. Int. J. Syst. Bacteriol. 48: 1129-1143.

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