The results of investigations on the morphology, physiology, pigment composition, light-harvesting antenna and reaction center organization, and electron carriers of five , and on phylogenetic relations among them, are summarized. On the basis of clear phenotypic differences and distinct phylogenetic positions shown by 16S ribosomal DNA analysis, the tentative species “” and “” are formally described as the type species of two new genera: gen. nov., sp. nov., and gen. nov., sp. nov., respectively. The genus is at present composed of the type species, , and two species, “” and “,” whose nomenclature is yet to be validated. All species studied group within the α-4 subclass of Proteobacteria.


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